Fix 3706 - close tab items in demo (#3707)

* Cleanup of launchSettings and Cards Page in Demo

* Revert "Cleanup of launchSettings and Cards Page in Demo"

This reverts commit ede38d4.

* fixed a bug in the demo app which removed the wrong TabItem in the TabControl of which the TabItems can be "closed"

* Clean up binding path

---------

Co-authored-by: Corvin Szimion <[email protected]>
Co-authored-by: Kevin Bost <[email protected]>

Author: 3 people

src/MainDemo.Wpf/Domain/TabsViewModel.cs

@@ -23,10 +23,10 @@ internal class TabsViewModel : ViewModelBase
 
     public TabsViewModel()
     {
-        var closeCommand = new AnotherCommandImplementation(_ =>
+        var closeCommand = new AnotherCommandImplementation(tab =>
         {
-            if (SelectedTab is { } selectedTab)
-                CustomTabs?.Remove(selectedTab);
+            if (tab is CustomTab castedTab)
+                CustomTabs?.Remove(castedTab);
         });
 
         CustomTabs = new()

src/MainDemo.Wpf/Tabs.xaml

@@ -732,7 +732,7 @@
             <DataTemplate>
               <StackPanel Orientation="Horizontal">
                 <TextBlock Text="{Binding CustomHeader}" />
-                <Button Command="{Binding CloseCommand}">
+                <Button Command="{Binding CloseCommand}" CommandParameter="{Binding}">
                   <Button.Template>
                     <ControlTemplate>
                       <materialDesign:PackIcon Kind="Close"