Invisible toolbar on toolwindow?

I have used the autohide toolwindow in my wpf application. In the main window it works very well but when I want to use it in one of my tabs it works but with unvisible toolbar. You can't see the (options, Autohide, and close buttons) on the toolwindow untill you put the cursor on it.

On more thing also is that the tittle is unvisible too. When you drag the toolwindow out of its place it has a thick black border.

Is there any support for that?

<docking:DockSite x:Name="dockSite" sampleCommon:DockSiteViewModelBehavior.IsManaged="true" ItemContainerRetentionMode="Wrapped" DocumentItemsSource="{Binding DocumentItems}" ToolItemsSource="{Binding ToolItems}" >

<docking:DockSite.AutoHideLeftContainers>
<docking:ToolWindowContainer >
<docking:ToolWindow Style="{StaticResource DockingItemStyle}" x:Name="LeftToolRegionWindow" Title="Avtals Trädvy" ImageSource="/Images/wood2.ico" />
</docking:ToolWindowContainer>
</docking:DockSite.AutoHideLeftContainers>

<docking:SplitContainer >

<docking:Workspace>
</docking:Workspace>
</docking:SplitContainer>
</docking:DockSite>