Android Question Panel above ImageView

If I understood correctly, probably it's just a matter of positioning the panel in the right place in the views list.
To have a view in front to other views it needs to be in a lower position on the views tree.

In this image the Panel will be in front of the 2 imageviews because it's the last added views and it's in front of everything else before.
You can simply drag and drop an element in the list in the desired position to manage this kind of visibility.

In this second image you will have the panel covering Imageview1, but imageview2 will be covering the panel.
Hope I explained it clearly, because I see by myself that I made a bit tricky explanation.

they need to have the same parent, and their position need to be set relatively to the Parent, and adjust the Z-Order