Add control to RadioSet message.

CHANGELOG.md

@@ -26,6 +26,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
   - `DirectoryTree.FileSelected`
   - `ListView.Highlighted` and `ListView.Selected`
   - `Markdown.TableOfContentsUpdated`, `Markdown.TableOfContentsSelected`, and `Markdown.LinkClicked`
+  - `RadioSet.Changed`
 
 ## [0.23.0] - 2023-05-03
 

src/textual/widgets/_radio_set.py

@@ -92,6 +92,15 @@ class RadioSet(Container, can_focus=True, can_focus_children=False):
             self.index = radio_set.pressed_index
             """The index of the [`RadioButton`][textual.widgets.RadioButton] that was pressed to make the change."""
 
+        @property
+        def control(self) -> RadioSet:
+            """A reference to the [`RadioSet`][textual.widgets.RadioSet] that was changed.
+
+            This is an alias for [`Changed.radio_set`][textual.widgets.RadioSet.Changed.radio_set]
+            and is used by the [`on`][textual.on] decorator.
+            """
+            return self.radio_set
+
         def __rich_repr__(self) -> rich.repr.Result:
             yield "radio_set", self.radio_set
             yield "pressed", self.pressed