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Let a UserControl stay in front of all Windows

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answered on 05 Apr 2011, 06:41 PM

Hello Yana,

thank for your tip, but the problem is, that i have a lot of UIElements that must stay in front of all windows. It's not possible for me to implement them all as RadWindows. That would kill my visual application design.

I've reflekted the code that's executed during opening a RadWindow and i found the part, that is responsible fot let the RadWindows stay in Front of all other UIElements.

Here's the code:

internal static void AttachPopupToVisualTree(Popup popup)
{
    UIElement root = Application.Current.RootVisual;
    if (root != null)
    {
        Panel panel = root as Panel;
        if (panel == null)
        {
            int childrenCount = VisualTreeHelper.GetChildrenCount(root);
            for (int i = 0; i < childrenCount; i++)
            {
                panel = VisualTreeHelper.GetChild(root, i) as Panel;
                if (panel != null)
                {
                    break;
                }
            }
        }
        if ((panel != null) && (popup != null))
        {
            DependencyObject visualParent = VisualTreeHelper.GetParent(popup);
            DependencyObject logicalParent = popup.Parent;
            if ((visualParent == null) && (logicalParent == null))
            {
                panel.Children.Insert(0, popup);
                popup.UpdateLayout();
            }
        }
    }
}

You see, the problem is, that the Root-Panel for the RasWindows is autmaticaly set to the Application.Current.RootVisual (or the first Panel found in the visual-tree).
Ist it possible to set the Root-Panel for the RadWindows manualy?
That would salve all my problems.

Thnaks!