I don't think you can get the UIElement from a single button instance. The button object may be represented by more than one UIElement. If the button is in a grid cell, for example, it will show up with a different UIElement in each cell.

If you are just using the editor control, where there is only a single instance, then you could get the element from the control using control.UIElement.GetDescendant and passing in the button as context.

But this seems like a really odd thing to do. You cannot modify the UIElement in this way... so why are you trying to get it? What are you trying to do?