ShowPopover’s parentControl is defined as type DesktopUIControl. I am currently bypassing this as every single control I use is a custom control (Containers usually) but this is causing problems. Would be nice to see an alternative where ParentControl could be of type DesktopContainer 
DesktopContainer.ShowPopover(parentControl As DesktopUIControl, facing As DesktopWindow.DisplaySides = DesktopWindow.DisplaySides.Bottom, detachable As Boolean = True)
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