diff --git a/changes/2267.misc.rst b/changes/2267.misc.rst
new file mode 100644
index 0000000000..165e2bd80b
--- /dev/null
+++ b/changes/2267.misc.rst
@@ -0,0 +1 @@
+Corrected event handling and app impl assignment on the Textual backend.
diff --git a/textual/pyproject.toml b/textual/pyproject.toml
index 15f6c7ed8a..7d22f57ffb 100644
--- a/textual/pyproject.toml
+++ b/textual/pyproject.toml
@@ -63,7 +63,7 @@ root = ".."
 
 [tool.setuptools_dynamic_dependencies]
 dependencies = [
-    "textual",
+    "textual >= 0.44.0",
     "toga-core == {version}",
 ]
 
diff --git a/textual/src/toga_textual/app.py b/textual/src/toga_textual/app.py
index fed7a0bce2..ff71825494 100644
--- a/textual/src/toga_textual/app.py
+++ b/textual/src/toga_textual/app.py
@@ -7,7 +7,7 @@
 
 class MainWindow(Window):
     def textual_close(self):
-        self.interface.app.on_exit(None)
+        self.interface.app.on_exit()
 
 
 class TogaApp(TextualApp):
@@ -23,6 +23,8 @@ def on_mount(self) -> None:
 class App:
     def __init__(self, interface):
         self.interface = interface
+        self.interface._impl = self
+
         self.loop = asyncio.new_event_loop()
         self.native = TogaApp(self)
 
diff --git a/textual/src/toga_textual/dialogs.py b/textual/src/toga_textual/dialogs.py
index 553379d48c..b0ab26e7f4 100644
--- a/textual/src/toga_textual/dialogs.py
+++ b/textual/src/toga_textual/dialogs.py
@@ -15,12 +15,12 @@ def __init__(self, impl):
         self.impl = impl
 
     def compose(self) -> ComposeResult:
-        self.title = TitleBar(self.impl.title)
+        self.titlebar = TitleBar(self.impl.title)
         self.impl.compose_content(self)
         self.buttons = self.impl.create_buttons()
         self.button_box = Horizontal(*self.buttons)
         self.container = Vertical(
-            self.title,
+            self.titlebar,
             self.content,
             self.button_box,
             id="dialog",
@@ -75,7 +75,7 @@ def textual_close(self):
         self.native.dismiss(None)
 
     def on_close(self, result: bool):
-        self.on_result(self, result)
+        self.on_result(result)
         self.interface.future.set_result(result)
 
 
@@ -298,7 +298,7 @@ def __init__(
         title,
         initial_directory,
         file_types,
-        multiselect,
+        multiple_select,
         on_result=None,
     ):
         super().__init__(
@@ -315,7 +315,7 @@ def __init__(
         else:
             self.filter_func = None
 
-        self.multiselect = multiselect
+        self.multiple_select = multiple_select
 
     def compose_content(self, dialog):
         dialog.directory_tree = FilteredDirectoryTree(self)
@@ -359,7 +359,7 @@ def __init__(
         interface,
         title,
         initial_directory,
-        multiselect,
+        multiple_select,
         on_result=None,
     ):
         super().__init__(
@@ -370,7 +370,7 @@ def __init__(
         )
         self.initial_directory = initial_directory if initial_directory else Path.cwd()
         self.filter_func = lambda path: path.is_dir()
-        self.multiselect = multiselect
+        self.multiple_select = multiple_select
 
     def compose_content(self, dialog):
         dialog.directory_tree = FilteredDirectoryTree(self)
diff --git a/textual/src/toga_textual/widgets/button.py b/textual/src/toga_textual/widgets/button.py
index 2ad28bc9a6..e907de3737 100644
--- a/textual/src/toga_textual/widgets/button.py
+++ b/textual/src/toga_textual/widgets/button.py
@@ -12,7 +12,7 @@ def __init__(self, impl):
         self.impl = impl
 
     def on_button_pressed(self, event: TextualButton.Pressed) -> None:
-        self.interface.on_press(None)
+        self.interface.on_press()
 
 
 class Button(Widget):
diff --git a/textual/src/toga_textual/widgets/textinput.py b/textual/src/toga_textual/widgets/textinput.py
index bedc193704..df2bbcd0b2 100644
--- a/textual/src/toga_textual/widgets/textinput.py
+++ b/textual/src/toga_textual/widgets/textinput.py
@@ -12,13 +12,13 @@ def __init__(self, impl):
         self.impl = impl
 
     def on_focus(self, event: TextualInput.Changed) -> None:
-        self.interface.on_gain_focus(None)
+        self.interface.on_gain_focus()
 
     def on_input_changed(self, event: TextualInput.Changed) -> None:
-        self.interface.on_change(None)
+        self.interface.on_change()
 
     def on_input_submitted(self, event: TextualInput.Submitted) -> None:
-        self.interface.on_confirm(None)
+        self.interface.on_confirm()
 
 
 class TextInput(Widget):
diff --git a/textual/src/toga_textual/window.py b/textual/src/toga_textual/window.py
index 2ce56e954f..239a8568c1 100644
--- a/textual/src/toga_textual/window.py
+++ b/textual/src/toga_textual/window.py
@@ -161,7 +161,7 @@ def get_visible(self):
         return True
 
     def textual_close(self):
-        self.interface.on_close(self)
+        self.interface.on_close()
 
     def close(self):
         self.native.dismiss(None)