Add BehaviorCollectionTemplate page

samples/BehaviorsTestApplication/Views/MainView.axaml

@@ -64,5 +64,8 @@
     <TabItem Header="Sliding Animation">
       <pages:SlidingAnimationView />
     </TabItem>
+    <TabItem Header="BehaviorCollectionTemplate">
+      <pages:BehaviorCollectionTemplateView />
+    </TabItem>
   </TabControl>
 </UserControl>

samples/BehaviorsTestApplication/Views/Pages/BehaviorCollectionTemplateView.axaml

@@ -0,0 +1,48 @@
+<UserControl x:Class="BehaviorsTestApplication.Views.Pages.BehaviorCollectionTemplateView"
+             xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             xmlns:vm="using:BehaviorsTestApplication.ViewModels"
+             x:CompileBindings="True" x:DataType="vm:MainWindowViewModel"
+             mc:Ignorable="d" d:DesignWidth="600" d:DesignHeight="450">
+  <Design.DataContext>
+    <vm:MainWindowViewModel />
+  </Design.DataContext>
+  <ItemsControl ItemsSource="{Binding Items}">
+    <ItemsControl.Styles>
+      <Style Selector="ItemsControl > ContentPresenter" x:DataType="vm:ItemViewModel">
+        <Setter Property="(Interaction.Behaviors)">
+          <BehaviorCollectionTemplate>
+            <BehaviorCollection>
+              <EventTriggerBehavior EventName="PointerPressed">
+                <PopupAction>
+                  <Border Background="White"
+                          BorderBrush="Black"
+                          BorderThickness="1"
+                          Padding="10">
+                    <StackPanel Orientation="Horizontal">
+                      <TextBlock Text="Value: " />
+                      <TextBlock Text="{Binding Value}" />
+                    </StackPanel>
+                  </Border>
+                </PopupAction>
+              </EventTriggerBehavior>
+            </BehaviorCollection>
+          </BehaviorCollectionTemplate>
+        </Setter>
+      </Style>
+      <Style Selector="ItemsControl > ContentPresenter">
+        <Setter Property="Background" Value="Transparent" />
+        <Setter Property="HorizontalContentAlignment" Value="Stretch" />
+        <Setter Property="Margin" Value="0" />
+        <Setter Property="Padding" Value="5" />
+      </Style>
+    </ItemsControl.Styles>
+    <ItemsControl.ItemTemplate>
+      <DataTemplate DataType="vm:ItemViewModel">
+        <TextBlock Text="{Binding Value}" />
+      </DataTemplate>
+    </ItemsControl.ItemTemplate>
+  </ItemsControl>
+</UserControl>

samples/BehaviorsTestApplication/Views/Pages/BehaviorCollectionTemplateView.axaml.cs

@@ -0,0 +1,17 @@
+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+
+namespace BehaviorsTestApplication.Views.Pages;
+
+public partial class BehaviorCollectionTemplateView : UserControl
+{
+    public BehaviorCollectionTemplateView()
+    {
+        InitializeComponent();
+    }
+
+    private void InitializeComponent()
+    {
+        AvaloniaXamlLoader.Load(this);
+    }
+}