WPF DataTrigger未在ItemsControl之外触发

我有一个自定义UserControl,它扩展了button控件并添加了两个新的依赖属性IsActive和Icon。在控件中,有DataTriggers根据值设置图标和活动状态。

我遇到的问题是控件只在ItemControl内部工作。下面是Items控件内外的控件的XAML部分。当控件不在项控件中时,触发器不工作。

<ItemsControl ItemsSource="{Binding HomeList}">
        <ItemsControl.ItemTemplate>
            <DataTemplate>
                <Controls:FunctionButton IsActive="True" Foreground="White" Content="Home" Icon="Home" Command="{Binding HomeClick}" />
            </DataTemplate>
        </ItemsControl.ItemTemplate>
</ItemsControl>
<Controls:FunctionButton IsActive="True" Foreground="White" Content="Home" Icon="Home" Command="{Binding HomeClick}" />

这是控件中的DataTrigger。

 <DataTrigger Binding="{Binding ElementName=MyFunctionButton, Path=Icon}" Value="Home">
       <Setter TargetName="HomeIcon" Property="Visibility" Value="Visible" />
 </DataTrigger>

唯一不起作用的属性是我的依赖项属性。

    public static readonly DependencyProperty IsActiveProperty = DependencyProperty.Register("IsActive", typeof(bool), typeof(FunctionButton));
 public static readonly DependencyProperty IconProperty = DependencyProperty.Register("Icon", typeof (Icon), typeof (FunctionButton));

 /// <summary>
    /// Gets or sets a value indicating whether this instance is active.
    /// </summary>
    /// <value><c>true</c> if this instance is active; otherwise, <c>false</c>.</value>
 public bool IsActive
 {
     get
     {
         return (bool) base.GetValue(IsActiveProperty);
     }
        set
        {
            base.SetValue(IsActiveProperty, value);
        }
 }

    /// <summary>
    /// Gets or sets the icon.
    /// </summary>
    /// <value>The icon.</value>
 public Icon Icon
 {
     get
     {
         return (Icon) base.GetValue(IconProperty);
     }
        set
        {
            base.SetValue(IconProperty, value);
        }
 }    

任何帮助都将不胜感激。