Add `Add`, `Remove` buttons and `SelectionMode` combobox to TreeViewPage.xaml

samples/ControlCatalog/Pages/TreeViewPage.xaml

@@ -6,16 +6,29 @@
     <TextBlock Classes="h2">Displays a hierachical tree of data.</TextBlock>
 
     <StackPanel Orientation="Horizontal"
-              Margin="0,16,0,0"
-              HorizontalAlignment="Center"
-              Spacing="16">
-      <TreeView SelectionMode="Multiple" Items="{Binding}" Width="250" Height="350">
-        <TreeView.ItemTemplate>
-          <TreeDataTemplate ItemsSource="{Binding Children}">
-            <TextBlock Text="{Binding Header}"/>
-          </TreeDataTemplate>
-        </TreeView.ItemTemplate>
-      </TreeView>
+                Margin="0,16,0,0"
+                HorizontalAlignment="Center"
+                Spacing="16">
+      <StackPanel Orientation="Vertical" Spacing="8">
+        <TreeView x:Name="treeView" SelectionMode="{Binding SelectionMode}" Items="{Binding Items}" Width="250" Height="350">
+          <TreeView.ItemTemplate>
+            <TreeDataTemplate ItemsSource="{Binding Children}">
+              <TextBlock Text="{Binding Header}"/>
+            </TreeDataTemplate>
+          </TreeView.ItemTemplate>
+        </TreeView>
+
+        <Button Command="{Binding AddItemCommand}">Add</Button>
+
+        <Button Command="{Binding RemoveItemCommand}">Remove</Button>
+
+        <ComboBox SelectedIndex="{Binding SelectionMode, Mode=TwoWay}">
+          <ComboBoxItem>Single</ComboBoxItem>
+          <ComboBoxItem>Multiple</ComboBoxItem>
+          <ComboBoxItem>Toggle</ComboBoxItem>
+          <ComboBoxItem>AlwaysSelected</ComboBoxItem>
+        </ComboBox>
+      </StackPanel>
     </StackPanel>
   </StackPanel>
 </UserControl>