public static void OnDropDownControlChanged <T>(T owner, PopupControlBase oldControl, PopupControlBase newControl) where T : FrameworkElement, IDropDownControlHost
{
if (owner.PopupHost == null)
{
SetOwnerLogicalChild(owner, newControl);
}
else
{
owner.PopupHost.DropDownControl = newControl;
}
}
private static void SetOwnerLogicalChild <T>(T owner, PopupControlBase dropDownControl) where T : FrameworkElement, IDropDownControlHost
{
var depObj = dropDownControl as DependencyObject;
owner.LogicalChild = depObj?.GetLogicalParent() == null ? dropDownControl : null;
}
