How can I get the parent Popup for a UIElement?

popup, silverlight, uielement

Solution

Because the `Button` is only added to the visual tree when the popup is being displayed.

Hmm... tricky ...

Edit

There is an assumption in the following that your popup is defined in the XAML of `UserControl` so whilst its child may not be in the visual tree the popup primitive control is.

Re-using some code I've posted before (I really must get me a blog).

public static class VisualTreeEnumeration
{
    public static IEnumerable<DependencyObject> Descendents(this DependencyObject root)
    {
        int count = VisualTreeHelper.GetChildrenCount(root);
        for (int i = 0; i < count; i++)
        {
            var child = VisualTreeHelper.GetChild(root, i);
            yield return child;
            foreach (var descendent in Descendents(child))
                yield return descendent;
        }
    }
}

This adds an extension method to the `DependencyObject` which uses the `VisualTreeHelper` to unify the search for objects added in the visual tree. So in the usercontrol code behind you can do this:-

var popup this.Descendents()
        .OfType<Popup>()
        .Where(p => p.Child == button)
        .FirstOrDefault();

This will find the `Popup` which is the parent of "button".

Problem

Original source