>Hi,
>Found some odd behaviour that I wasn't expecting. I have a Combobox in a Toolbar which calls code to locate the top level container in which it is sited. Here's the helper method (which is called with a reference to the ComboBox):

public static DependencyObject GetTopLevelControl(DependencyObject control)
>        {
>            System.Diagnostics.Debug.WriteLine("Searching for top level control");
>            DependencyObject tmp = control;
>            DependencyObject parent = null;
>             while ((tmp = VisualTreeHelper.GetParent(tmp)) != null)
>            {
>                System.Diagnostics.Debug.WriteLine("Item: " +tmp.ToString());
>                parent = tmp;
>            }
>            return parent;
>        }

>Normally the output from the above is:

Searching for top level control
>Item: System.Windows.Controls.Primitives.ToolBarPanel
>Item: System.Windows.Controls.DockPanel
>Item: System.Windows.Controls.Border
>Item: System.Windows.Controls.Grid
>Item: System.Windows.Controls.ToolBar Header: Items.Count:4
>Item: System.Windows.Controls.ToolBarTray
>Item: System.Windows.Controls.DockPanel
>Item: System.Windows.Controls.ContentPresenter
>Item: System.Windows.Controls.Border
>Item: WpfApplication1.Pages.AdminDesign
>Item: System.Windows.Controls.ContentPresenter
>Item: System.Windows.Documents.AdornerDecorator
>Item: System.Windows.Controls.Grid
>Item: System.Windows.Controls.DockPanel
>Item: System.Windows.Controls.Border
>Item: System.Windows.Navigation.NavigationWindow

>However when the Toolbar overflow panel is visible I get this:

>Searching for top level control
>Item: System.Windows.Controls.Primitives.ToolBarPanel
>Item: System.Windows.Controls.DockPanel
>Item: System.Windows.Controls.Border
>Item: System.Windows.Controls.Grid
>Item: System.Windows.Controls.ToolBar Header: Items.Count:2
>Item: System.Windows.Controls.ToolBarTray
>Item: System.Windows.Controls.ContentPresenter
>Item: System.Windows.Controls.Border
>Item: LLControls.UserControls.ConnectionOwner
>Item: System.Windows.Controls.Primitives.ToolBarOverflowPanel
>Item: System.Windows.Controls.Border
>Item: Microsoft.Windows.Themes.SystemDropShadowChrome
>Item: System.Windows.Documents.NonLogicalAdornerDecorator
>Item: System.Windows.Controls.Decorator
>Item: System.Windows.Controls.Primitives.PopupRoot

(which isn't much use) This happens whether the ComboBox itself is in the overflow panel or not. Can't find any documentation for this behaviour - anyone explain?
>(It's not actually a problem since I can use the LogicalTreeHelper instead which is consistent (and more efficient :-})
>
>P.S Quiet here lately ?


I'm taking a guess here, but non visible components don't take up any space in the tree and are not visible to any VisualTreeHelper methods. We had a tab control with 3 pages and 3 grids .... only the visible tab and grid could be seen by walking the visual tree.

Hope this helps....