diff --git a/core/src/apps/homescreen/__init__.py b/core/src/apps/homescreen/__init__.py
index 0b925cae7..1b9cf2f47 100644
--- a/core/src/apps/homescreen/__init__.py
+++ b/core/src/apps/homescreen/__init__.py
@@ -6,11 +6,11 @@ class HomescreenBase(ui.Layout):
     RENDER_SLEEP = loop.SLEEP_FOREVER
 
     def __init__(self) -> None:
+        super().__init__()
         self.label = storage.device.get_label() or "My Trezor"
         self.image = storage.device.get_homescreen() or res.load(
             "apps/homescreen/res/bg.toif"
         )
-        self.repaint = True
 
     def on_tap(self) -> None:
         """Called when the user taps the screen."""
diff --git a/core/src/apps/management/recovery_device/keyboard_bip39.py b/core/src/apps/management/recovery_device/keyboard_bip39.py
index 5ac0a9cb1..f72bd7977 100644
--- a/core/src/apps/management/recovery_device/keyboard_bip39.py
+++ b/core/src/apps/management/recovery_device/keyboard_bip39.py
@@ -87,8 +87,8 @@ class InputButton(Button):
 
 class Prompt(ui.Component):
     def __init__(self, prompt: str) -> None:
+        super().__init__()
         self.prompt = prompt
-        self.repaint = True
 
     def on_render(self) -> None:
         if self.repaint:
@@ -99,6 +99,7 @@ class Prompt(ui.Component):
 
 class Bip39Keyboard(ui.Layout):
     def __init__(self, prompt: str) -> None:
+        super().__init__()
         self.prompt = Prompt(prompt)
 
         icon_back = res.load(ui.ICON_BACK)
diff --git a/core/src/apps/management/recovery_device/keyboard_slip39.py b/core/src/apps/management/recovery_device/keyboard_slip39.py
index 981fa3da8..6eacbf1a3 100644
--- a/core/src/apps/management/recovery_device/keyboard_slip39.py
+++ b/core/src/apps/management/recovery_device/keyboard_slip39.py
@@ -90,8 +90,8 @@ class InputButton(Button):
 
 class Prompt(ui.Component):
     def __init__(self, prompt: str) -> None:
+        super().__init__()
         self.prompt = prompt
-        self.repaint = True
 
     def on_render(self) -> None:
         if self.repaint:
@@ -102,6 +102,7 @@ class Prompt(ui.Component):
 
 class Slip39Keyboard(ui.Layout):
     def __init__(self, prompt: str) -> None:
+        super().__init__()
         self.prompt = Prompt(prompt)
 
         icon_back = res.load(ui.ICON_BACK)
diff --git a/core/src/apps/management/recovery_device/layout.py b/core/src/apps/management/recovery_device/layout.py
index c8ffbe18c..599d99a14 100644
--- a/core/src/apps/management/recovery_device/layout.py
+++ b/core/src/apps/management/recovery_device/layout.py
@@ -206,10 +206,10 @@ async def show_group_threshold_reached(ctx: wire.GenericContext) -> None:
 
 class RecoveryHomescreen(ui.Component):
     def __init__(self, text: str, subtext: str = None):
+        super().__init__()
         self.text = text
         self.subtext = subtext
         self.dry_run = storage.recovery.is_dry_run()
-        self.repaint = True
 
     def on_render(self) -> None:
         if not self.repaint:
diff --git a/core/src/apps/management/reset_device/layout.py b/core/src/apps/management/reset_device/layout.py
index ff2c240dd..e30ae0121 100644
--- a/core/src/apps/management/reset_device/layout.py
+++ b/core/src/apps/management/reset_device/layout.py
@@ -524,10 +524,10 @@ class Slip39NumInput(ui.Component):
     SET_GROUP_THRESHOLD = object()
 
     def __init__(self, step, count, min_count, max_count, group_id=None):
+        super().__init__()
         self.step = step
         self.input = NumInput(count, min_count=min_count, max_count=max_count)
         self.input.on_change = self.on_change
-        self.repaint = True
         self.group_id = group_id
 
     def dispatch(self, event, x, y):
@@ -605,6 +605,7 @@ class MnemonicWordSelect(ui.Layout):
     NUM_OF_CHOICES = 3
 
     def __init__(self, words, share_index, word_index, count, group_index=None):
+        super().__init__()
         self.words = words
         self.share_index = share_index
         self.word_index = word_index
diff --git a/core/src/apps/monero/layout/confirms.py b/core/src/apps/monero/layout/confirms.py
index 10b4425fb..6f0c8fc4e 100644
--- a/core/src/apps/monero/layout/confirms.py
+++ b/core/src/apps/monero/layout/confirms.py
@@ -143,6 +143,7 @@ async def _require_confirm_unlock_time(ctx, unlock_time):
 
 class TransactionStep(ui.Component):
     def __init__(self, state, info):
+        super().__init__()
         self.state = state
         self.info = info
 
@@ -159,6 +160,7 @@ class TransactionStep(ui.Component):
 
 class KeyImageSyncStep(ui.Component):
     def __init__(self, current, total_num):
+        super().__init__()
         self.current = current
         self.total_num = total_num
 
@@ -172,6 +174,7 @@ class KeyImageSyncStep(ui.Component):
 
 class LiveRefreshStep(ui.Component):
     def __init__(self, current):
+        super().__init__()
         self.current = current
 
     def on_render(self):
diff --git a/core/src/apps/webauthn/add_resident_credential.py b/core/src/apps/webauthn/add_resident_credential.py
index c5d958c64..c00c64665 100644
--- a/core/src/apps/webauthn/add_resident_credential.py
+++ b/core/src/apps/webauthn/add_resident_credential.py
@@ -16,6 +16,7 @@ if False:
 
 class ConfirmAddCredential(ConfirmInfo):
     def __init__(self, cred: Fido2Credential):
+        super().__init__()
         self._cred = cred
         self.load_icon(cred.rp_id_hash)
 
diff --git a/core/src/apps/webauthn/confirm.py b/core/src/apps/webauthn/confirm.py
index f81cc026c..659a7afec 100644
--- a/core/src/apps/webauthn/confirm.py
+++ b/core/src/apps/webauthn/confirm.py
@@ -34,8 +34,8 @@ class ConfirmInfo:
 
 class ConfirmContent(ui.Component):
     def __init__(self, info: ConfirmInfo) -> None:
+        super().__init__()
         self.info = info
-        self.repaint = True
 
     def on_render(self) -> None:
         if self.repaint:
diff --git a/core/src/apps/webauthn/remove_resident_credential.py b/core/src/apps/webauthn/remove_resident_credential.py
index b18af0324..4f24b331b 100644
--- a/core/src/apps/webauthn/remove_resident_credential.py
+++ b/core/src/apps/webauthn/remove_resident_credential.py
@@ -18,6 +18,7 @@ if False:
 
 class ConfirmRemoveCredential(ConfirmInfo):
     def __init__(self, cred: Fido2Credential):
+        super().__init__()
         self._cred = cred
         self.load_icon(cred.rp_id_hash)
 
diff --git a/core/src/trezor/ui/__init__.py b/core/src/trezor/ui/__init__.py
index 5fd548135..8b52fe81e 100644
--- a/core/src/trezor/ui/__init__.py
+++ b/core/src/trezor/ui/__init__.py
@@ -238,6 +238,9 @@ class Component:
     an instance of `Result`.
     """
 
+    def __init__(self) -> None:
+        self.repaint = True
+
     def dispatch(self, event: int, x: int, y: int) -> None:
         if event is RENDER:
             self.on_render()
diff --git a/core/src/trezor/ui/button.py b/core/src/trezor/ui/button.py
index ddd1ee706..88f023ecb 100644
--- a/core/src/trezor/ui/button.py
+++ b/core/src/trezor/ui/button.py
@@ -133,6 +133,7 @@ class Button(ui.Component):
         content: ButtonContent,
         style: ButtonStyleType = ButtonDefault,
     ) -> None:
+        super().__init__()
         if isinstance(content, str):
             self.text = content
             self.icon = b""
@@ -146,7 +147,6 @@ class Button(ui.Component):
         self.active_style = style.active
         self.disabled_style = style.disabled
         self.state = _INITIAL
-        self.repaint = True
 
     def enable(self) -> None:
         if self.state is not _INITIAL:
diff --git a/core/src/trezor/ui/checklist.py b/core/src/trezor/ui/checklist.py
index 8853cfe5e..673f00763 100644
--- a/core/src/trezor/ui/checklist.py
+++ b/core/src/trezor/ui/checklist.py
@@ -15,11 +15,11 @@ _CHECKLIST_OFFSET_X_ICON = const(0)
 
 class Checklist(ui.Component):
     def __init__(self, title: str, icon: str) -> None:
+        super().__init__()
         self.title = title
         self.icon = icon
         self.items = []  # type: List[ChecklistItem]
         self.active = 0
-        self.repaint = True
 
     def add(self, item: ChecklistItem) -> None:
         self.items.append(item)
diff --git a/core/src/trezor/ui/confirm.py b/core/src/trezor/ui/confirm.py
index ab972c85f..2f04f1e11 100644
--- a/core/src/trezor/ui/confirm.py
+++ b/core/src/trezor/ui/confirm.py
@@ -38,6 +38,7 @@ class Confirm(ui.Layout):
         cancel_style: ButtonStyleType = DEFAULT_CANCEL_STYLE,
         major_confirm: bool = False,
     ) -> None:
+        super().__init__()
         self.content = content
 
         if confirm is not None:
@@ -192,6 +193,7 @@ class InfoConfirm(ui.Layout):
         info: ButtonContent = DEFAULT_INFO,
         info_style: ButtonStyleType = DEFAULT_INFO_STYLE,
     ) -> None:
+        super().__init__()
         self.content = content
 
         self.confirm = Button(ui.grid(14), confirm, confirm_style)
@@ -243,6 +245,7 @@ class HoldToConfirm(ui.Layout):
         loader_style: LoaderStyleType = DEFAULT_LOADER_STYLE,
         cancel: bool = True,
     ):
+        super().__init__()
         self.content = content
 
         self.loader = Loader(loader_style)
diff --git a/core/src/trezor/ui/container.py b/core/src/trezor/ui/container.py
index b660b248b..8b24d91b8 100644
--- a/core/src/trezor/ui/container.py
+++ b/core/src/trezor/ui/container.py
@@ -6,6 +6,7 @@ if False:
 
 class Container(ui.Component):
     def __init__(self, *children: ui.Component):
+        super().__init__()
         self.children = children
 
     def dispatch(self, event: int, x: int, y: int) -> None:
diff --git a/core/src/trezor/ui/info.py b/core/src/trezor/ui/info.py
index b47021d2b..887e60edd 100644
--- a/core/src/trezor/ui/info.py
+++ b/core/src/trezor/ui/info.py
@@ -35,6 +35,7 @@ class InfoConfirm(ui.Layout):
         confirm: ButtonContent = DEFAULT_CONFIRM,
         style: InfoConfirmStyleType = DEFAULT_STYLE,
     ) -> None:
+        super().__init__()
         self.text = text.split()
         self.style = style
         panel_area = ui.grid(0, n_x=1, n_y=1)
@@ -42,7 +43,6 @@ class InfoConfirm(ui.Layout):
         confirm_area = ui.grid(4, n_x=1)
         self.confirm = Button(confirm_area, confirm, style.button)
         self.confirm.on_click = self.on_confirm  # type: ignore
-        self.repaint = True
 
     def dispatch(self, event: int, x: int, y: int) -> None:
         if event == ui.RENDER:
diff --git a/core/src/trezor/ui/loader.py b/core/src/trezor/ui/loader.py
index 7ff90583a..27a5b8633 100644
--- a/core/src/trezor/ui/loader.py
+++ b/core/src/trezor/ui/loader.py
@@ -39,6 +39,7 @@ _TARGET_MS = const(1000)
 
 class Loader(ui.Component):
     def __init__(self, style: LoaderStyleType = LoaderDefault) -> None:
+        super().__init__()
         self.normal_style = style.normal
         self.active_style = style.active
         self.target_ms = _TARGET_MS
@@ -98,6 +99,7 @@ class Loader(ui.Component):
 
 class LoadingAnimation(ui.Layout):
     def __init__(self, style: LoaderStyleType = LoaderDefault) -> None:
+        super().__init__()
         self.loader = Loader(style)
         self.loader.on_finish = self.on_finish  # type: ignore
         self.loader.start()
diff --git a/core/src/trezor/ui/num_input.py b/core/src/trezor/ui/num_input.py
index cbd3bfe87..a5005db9c 100644
--- a/core/src/trezor/ui/num_input.py
+++ b/core/src/trezor/ui/num_input.py
@@ -5,6 +5,7 @@ from trezor.ui.text import LABEL_CENTER, Label
 
 class NumInput(ui.Component):
     def __init__(self, count: int = 5, max_count: int = 16, min_count: int = 1) -> None:
+        super().__init__()
         self.count = count
         self.max_count = max_count
         self.min_count = min_count
diff --git a/core/src/trezor/ui/passphrase.py b/core/src/trezor/ui/passphrase.py
index 67b23deab..f99d77527 100644
--- a/core/src/trezor/ui/passphrase.py
+++ b/core/src/trezor/ui/passphrase.py
@@ -115,8 +115,8 @@ class Input(Button):
 
 class Prompt(ui.Component):
     def __init__(self, text: str) -> None:
+        super().__init__()
         self.text = text
-        self.repaint = True
 
     def on_render(self) -> None:
         if self.repaint:
@@ -130,6 +130,7 @@ CANCELLED = object()
 
 class PassphraseKeyboard(ui.Layout):
     def __init__(self, prompt: str, max_length: int, page: int = 1) -> None:
+        super().__init__()
         self.prompt = Prompt(prompt)
         self.max_length = max_length
         self.page = page
diff --git a/core/src/trezor/ui/pin.py b/core/src/trezor/ui/pin.py
index c2113edb9..16a6d3d26 100644
--- a/core/src/trezor/ui/pin.py
+++ b/core/src/trezor/ui/pin.py
@@ -32,10 +32,10 @@ def generate_digits() -> Iterable[int]:
 
 class PinInput(ui.Component):
     def __init__(self, prompt: str, subprompt: Optional[str], pin: str) -> None:
+        super().__init__()
         self.prompt = prompt
         self.subprompt = subprompt
         self.pin = pin
-        self.repaint = True
 
     def on_render(self) -> None:
         if self.repaint:
diff --git a/core/src/trezor/ui/popup.py b/core/src/trezor/ui/popup.py
index 6993ea325..25704ab25 100644
--- a/core/src/trezor/ui/popup.py
+++ b/core/src/trezor/ui/popup.py
@@ -6,6 +6,7 @@ if False:
 
 class Popup(ui.Layout):
     def __init__(self, content: ui.Component, time_ms: int = 0) -> None:
+        super().__init__()
         self.content = content
         if utils.DISABLE_ANIMATION:
             self.time_ms = 0
diff --git a/core/src/trezor/ui/qr.py b/core/src/trezor/ui/qr.py
index cfa23a7b3..85be58d5a 100644
--- a/core/src/trezor/ui/qr.py
+++ b/core/src/trezor/ui/qr.py
@@ -3,11 +3,11 @@ from trezor import ui
 
 class Qr(ui.Component):
     def __init__(self, data: str, x: int, y: int, scale: int):
+        super().__init__()
         self.data = data
         self.x = x
         self.y = y
         self.scale = scale
-        self.repaint = True
 
     def on_render(self) -> None:
         if self.repaint:
diff --git a/core/src/trezor/ui/scroll.py b/core/src/trezor/ui/scroll.py
index 0d002b602..ce92f1e04 100644
--- a/core/src/trezor/ui/scroll.py
+++ b/core/src/trezor/ui/scroll.py
@@ -51,10 +51,10 @@ class Paginated(ui.Layout):
     def __init__(
         self, pages: List[ui.Component], page: int = 0, one_by_one: bool = False
     ):
+        super().__init__()
         self.pages = pages
         self.page = page
         self.one_by_one = one_by_one
-        self.repaint = True
 
     def dispatch(self, event: int, x: int, y: int) -> None:
         pages = self.pages
@@ -131,6 +131,7 @@ class PageWithButtons(ui.Component):
         index: int,
         count: int,
     ) -> None:
+        super().__init__()
         self.content = content
         self.paginated = paginated
         self.index = index
@@ -188,6 +189,7 @@ class PaginatedWithButtons(ui.Layout):
     def __init__(
         self, pages: List[ui.Component], page: int = 0, one_by_one: bool = False
     ) -> None:
+        super().__init__()
         self.pages = [
             PageWithButtons(p, self, i, len(pages)) for i, p in enumerate(pages)
         ]
diff --git a/core/src/trezor/ui/swipe.py b/core/src/trezor/ui/swipe.py
index ffeae2c3a..90451a123 100644
--- a/core/src/trezor/ui/swipe.py
+++ b/core/src/trezor/ui/swipe.py
@@ -19,6 +19,7 @@ _SWIPE_TRESHOLD = const(30)
 
 class Swipe(ui.Component):
     def __init__(self, directions: int = SWIPE_ALL, area: ui.Area = None) -> None:
+        super().__init__()
         if area is None:
             area = (0, 0, ui.WIDTH, ui.HEIGHT)
         self.area = area
diff --git a/core/src/trezor/ui/text.py b/core/src/trezor/ui/text.py
index 57f7188f4..2a742561f 100644
--- a/core/src/trezor/ui/text.py
+++ b/core/src/trezor/ui/text.py
@@ -129,13 +129,13 @@ class Text(ui.Component):
         max_lines: int = TEXT_MAX_LINES,
         new_lines: bool = True,
     ):
+        super().__init__()
         self.header_text = header_text
         self.header_icon = header_icon
         self.icon_color = icon_color
         self.max_lines = max_lines
         self.new_lines = new_lines
         self.content = []  # type: List[TextContent]
-        self.repaint = True
 
     def normal(self, *content: TextContent) -> None:
         self.content.append(ui.NORMAL)
@@ -187,11 +187,11 @@ class Label(ui.Component):
         align: int = LABEL_LEFT,
         style: int = ui.NORMAL,
     ) -> None:
+        super().__init__()
         self.area = area
         self.content = content
         self.align = align
         self.style = style
-        self.repaint = True
 
     def on_render(self) -> None:
         if self.repaint:
diff --git a/core/src/trezor/ui/word_select.py b/core/src/trezor/ui/word_select.py
index 6d92d6970..a9ce2e4aa 100644
--- a/core/src/trezor/ui/word_select.py
+++ b/core/src/trezor/ui/word_select.py
@@ -10,6 +10,7 @@ if False:
 
 class WordSelector(ui.Layout):
     def __init__(self, content: ui.Component) -> None:
+        super().__init__()
         self.content = content
         self.w12 = Button(ui.grid(6, n_y=4), "12")
         self.w12.on_click = self.on_w12  # type: ignore