chore: add avalonia RadioButton demo.

src/Avalonia/HandyControlDemo_Avalonia/UserControl/Styles/RadioButtonDemoCtl.axaml.cs

@@ -0,0 +1,10 @@
+namespace HandyControlDemo.UserControl;
+
+public partial class RadioButtonDemoCtl : Avalonia.Controls.UserControl
+{
+    public RadioButtonDemoCtl()
+    {
+        InitializeComponent();
+    }
+}
+

src/Avalonia/HandyControl_Avalonia/Controls/Attach/VisualElement.cs

@@ -0,0 +1,50 @@
+using Avalonia;
+using Avalonia.Media;
+
+namespace HandyControl.Controls;
+
+public class VisualElement
+{
+    public static readonly AttachedProperty<IBrush> HighlightBrushProperty =
+        AvaloniaProperty.RegisterAttached<VisualElement, AvaloniaObject, IBrush>("HighlightBrush", inherits: true);
+
+    public static void SetHighlightBrush(AvaloniaObject element, IBrush value) =>
+        element.SetValue(HighlightBrushProperty, value);
+
+    public static IBrush GetHighlightBrush(AvaloniaObject element) => element.GetValue(HighlightBrushProperty);
+
+    public static readonly AttachedProperty<IBrush> HighlightBackgroundProperty =
+        AvaloniaProperty.RegisterAttached<VisualElement, AvaloniaObject, IBrush>("HighlightBackground", inherits: true);
+
+    public static void SetHighlightBackground(AvaloniaObject element, IBrush value) =>
+        element.SetValue(HighlightBackgroundProperty, value);
+
+    public static IBrush GetHighlightBackground(AvaloniaObject element) =>
+        element.GetValue(HighlightBackgroundProperty);
+
+    public static readonly AttachedProperty<IBrush> HighlightBorderBrushProperty =
+        AvaloniaProperty.RegisterAttached<VisualElement, AvaloniaObject, IBrush>("HighlightBorderBrush",
+            inherits: true);
+
+    public static void SetHighlightBorderBrush(AvaloniaObject element, IBrush value) =>
+        element.SetValue(HighlightBorderBrushProperty, value);
+
+    public static IBrush GetHighlightBorderBrush(AvaloniaObject element) =>
+        element.GetValue(HighlightBorderBrushProperty);
+
+    public static readonly AttachedProperty<IBrush> HighlightForegroundProperty =
+        AvaloniaProperty.RegisterAttached<VisualElement, AvaloniaObject, IBrush>("HighlightForeground", inherits: true);
+
+    public static void SetHighlightForeground(AvaloniaObject element, IBrush value) =>
+        element.SetValue(HighlightForegroundProperty, value);
+
+    public static IBrush GetHighlightForeground(AvaloniaObject element) =>
+        element.GetValue(HighlightForegroundProperty);
+
+    public static readonly AttachedProperty<string> TextProperty =
+        AvaloniaProperty.RegisterAttached<VisualElement, AvaloniaObject, string>("Text");
+
+    public static void SetText(AvaloniaObject element, string value) => element.SetValue(TextProperty, value);
+
+    public static string GetText(AvaloniaObject element) => element.GetValue(TextProperty);
+}

src/Avalonia/HandyControl_Avalonia/Themes/Basic/Converters.axaml

@@ -2,8 +2,9 @@
                     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                     xmlns:converter="clr-namespace:HandyControl.Tools.Converter">
 
+    <converter:Boolean2BooleanReConverter x:Key="Boolean2BooleanReConverter" />
     <converter:BorderClipConverter x:Key="BorderClipConverter" />
-    <converter:BorderCircularConverter x:Key="BorderCircularConverter"/>
+    <converter:BorderCircularConverter x:Key="BorderCircularConverter" />
     <converter:GeometrySpacingConverter x:Key="GeometrySpacingConverter" />
 
 </ResourceDictionary>

src/Avalonia/HandyControl_Avalonia/Themes/Styles/Button.axaml

@@ -29,7 +29,7 @@
                 Value="{Binding $self.(hc:BorderElement.CornerRadius)}" />
         <Setter Property="Template">
             <ControlTemplate>
-                <Grid>
+                <Panel>
                     <Border Background="{TemplateBinding Background}"
                             CornerRadius="{TemplateBinding CornerRadius}" />
                     <Border BorderThickness="{TemplateBinding BorderThickness}"
@@ -53,7 +53,7 @@
                                               Margin="{Binding Path=(hc:IconElement.Geometry), RelativeSource={RelativeSource TemplatedParent}, Converter={StaticResource GeometrySpacingConverter}, ConverterParameter='6,0,0,0'}" />
                         </StackPanel>
                     </Border>
-                </Grid>
+                </Panel>
             </ControlTemplate>
         </Setter>