add readonly password reveal

Toolkit.UI.Avalonia/BooleanToPasswordCharConverter.cs

@@ -0,0 +1,21 @@
+using Avalonia.Data.Converters;
+using Avalonia.Markup.Xaml;
+using System.Globalization;
+
+namespace Toolkit.UI.Avalonia;
+
+public class BooleanToPasswordCharConverter :
+    MarkupExtension,
+    IValueConverter
+{
+    public override object ProvideValue(IServiceProvider serviceProvider) => 
+        this;
+
+    public char PasswordChar { get; set; }
+
+    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture) =>
+        value is bool boolValue ? boolValue ? '\0' : PasswordChar : (object)PasswordChar;
+
+    public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture) => 
+        throw new NotImplementedException();
+}

Toolkit.UI.Controls.Avalonia/SettingsExpander/SettingsExpander.axaml

@@ -70,6 +70,7 @@
                         <controls:SettingsExpanderItem
                             Name="ContentHost"
                             Padding="{DynamicResource SettingsExpanderPadding}"
+                            Action="{TemplateBinding Action}"
                             ActionIconSource="{TemplateBinding ActionIconSource}"
                             ActionTemplate="{TemplateBinding ActionTemplate}"
                             Background="Transparent"
@@ -152,7 +153,6 @@
                             Grid.Column="2"
                             Content="{TemplateBinding Action}"
                             ContentTemplate="{TemplateBinding ActionTemplate}" />
-                        <Button Grid.Column="2">dsfdsfsdfs</Button>
                         <Viewbox
                             Name="ActionIconHost"
                             Grid.Column="3"