How to handle LayoutAnchorable after Deserialize?

[yaoyulian]

avalondock:LayoutPanel
avalondock:LayoutAnchorablePane
<avalondock:LayoutAnchorable x:Name="LayoutAnchorable1" Title="LayoutAnchorable1" ContentId="LayoutAnchorable1"></avalondock:LayoutAnchorable>
<avalondock:LayoutAnchorable x:Name="LayoutAnchorable2" Title="LayoutAnchorable2" ContentId="LayoutAnchorable2"></avalondock:LayoutAnchorable>
</avalondock:LayoutAnchorablePane>
</avalondock:LayoutPanel>

void Button_Show_LayoutAnchorable1_Click(object sender, RoutedEventArgs e)
{
LayoutAnchorable1.IsActive = true; //this will bring LayoutAnchorable1 to front
}

void Button_Show_LayoutAnchorable2_Click(object sender, RoutedEventArgs e)
{
LayoutAnchorable2.IsActive = true; //this will bring LayoutAnchorable2 to front
}

if I called XmlLayoutSerializer.Deserialize to restore preserved layout in DockManager_Loaded, the click function will have no effect. How can I bring LayoutAnchorable to front in C# code after Deserialize?