Change scroll window to a different level?

I have a stage with a scroll window on the bottom with many buttons. The buttons open a large image in the window above the scroll pane. The large image has drag and drop properties so the image can be moved to see the of stage portions. The image is on level one so when you drag downward the scroll pane is then hidden under the image. I would like to move the scroll pane to level 2 so that it will always remains on top. Anyone where or how to change this property?

Thank you