ItemsControl元素已经是另一个元素的子元素

我正在尝试动态添加控件到我的ItemsControl。我使用RadHubTile控制，但我认为这适用于任何控制。我的XAML

<ItemsControl x:Name="itemsControl" ItemsSource="{Binding}">
    <ItemsControl.ItemsPanel>
        <ItemsPanelTemplate>
            <telerikPrimitives:RadUniformGrid x:Name="radUniformGrid" NumberOfColumns="3" NumberOfRows="3" />       
        </ItemsPanelTemplate>
    </ItemsControl.ItemsPanel>
</ItemsControl>

添加新的控件工作正常，并正确绑定。当我从页面导航离开并返回时，就会出现这个问题。我得到这个错误

MS.Internal.WrappedException: Element is already the child of another element. --->     System.InvalidOperationException: Element is already the child of another element.
   at MS.Internal.XcpImports.CheckHResult(UInt32 hr)
   at MS.Internal.XcpImports.Collection_AddValue[T](PresentationFrameworkCollection`1     collection, CValue value)
   at MS.Internal.XcpImports.Collection_AddDependencyObject[T]    (PresentationFrameworkCollection`1 collection, DependencyObject value)    
 at System.Windows.PresentationFrameworkCollection`1.AddDependencyObject(DependencyObject value)
   at System.Windows.Controls.UIElementCollection.AddInternal(UIElement value)
   at System.Windows.PresentationFrameworkCollection`1.Add(T value)
   at System.Windows.Controls.ItemsControl.AddVisualChild(Int32 index, DependencyObject container, Boolean needPrepareContainer)
   at System.Windows.Controls.ItemsControl.AddContainers()
   at System.Windows.Controls.ItemsControl.RecreateVisualChildren(IntPtr unmanagedObj)
   --- End of inner exception stack trace ---

我怀疑这是因为radHubTile元素已经有父元素。也许我必须从可视化树或从ItemsControl移出页面时删除它们?我试图通过OnBackKeyPress背后的代码做到这一点，但我不确定如何实现这一点。或者这是否能解决问题。

protected override void OnBackKeyPress(System.ComponentModel.CancelEventArgs e)
{
    foreach (var item in itemsControl.Items)
    {
        UIElement uiElement =
            (UIElement)itemsControl.ItemContainerGenerator.ContainerFromItem(item);
        //this.itemsControl.Items.Remove(uiElement);      
    }            
}

编辑

当试图删除uiElement

{System.InvalidOperationException: Operation not supported on read-only collection.

有什么建议吗?谢谢。