Drag-and-drop AbsoluteLayout overlapping components

I’m displaying four vaadin-chart graphs embedded in four different panels on a main absolutelayout, in dashboard style. I added the option to drag&drop the panels inside the main layout using this add-on:
https://vaadin.com/directory#!addon/dragdroplayouts

The featrue works fine, but when one panel is dragged on top of another, the overlap is always resolved by the order in which the panels were added to the layout. In other words, after adding the four panels (absolutelayout.addComponent) to the layout, the first panel is always displayed behind the other 3. I can’t seem to be able to bring the first panel to the “front” of the view/stack of panels. If I want to drag the first panel around the main layout fully displayed, I need to delete the other three which seems a bit inconvenient.

Is there a simple fix for this? Also, is this the right forum for the question or should I contact the author of this add-on directly?

-Henri