Removed unused Footer property on TabbedCommandBarItem

Author: yoshiask

Microsoft.Toolkit.Uwp.UI.Controls/TabbedCommandBar/TabbedCommandBar.xaml

@@ -77,9 +77,6 @@
                                                     <ItemsStackPanel Orientation="Horizontal" />
                                                 </ItemsPanelTemplate>
                                             </NavigationViewList.ItemsPanel>
-                                            <NavigationViewList.ItemContainerTransitions>
-                                                <TransitionCollection />
-                                            </NavigationViewList.ItemContainerTransitions>
                                         </NavigationViewList>
                                         <Button x:Name="TopNavOverflowButton"
                                                 Grid.Column="4"

Microsoft.Toolkit.Uwp.UI.Controls/TabbedCommandBar/TabbedCommandBarItem.cs

@@ -43,24 +43,6 @@ public object Header
             set => SetValue(HeaderProperty, value);
         }
 
-        /// <summary>
-        /// Identifies the <see cref="Footer"/> property.
-        /// </summary>
-        public static readonly DependencyProperty FooterProperty = DependencyProperty.Register(
-            nameof(Footer),
-            typeof(UIElement),
-            typeof(TabbedCommandBarItem),
-            new PropertyMetadata(new Border()));
-
-        /// <summary>
-        /// Gets or sets the <see cref="UIElement"/> to be displayed in the footer of the tab.
-        /// </summary>
-        public UIElement Footer
-        {
-            get => (UIElement)GetValue(FooterProperty);
-            set => SetValue(FooterProperty, value);
-        }
-
         /// <summary>
         /// Identifies the <see cref="IsContextual"/> property.
         /// </summary>