Keeping drag object on top
I have a drag & drop exercise that let's you build and empty computer by dragging parts to the correct place. It uses a base image of the empty computer that has invisible targets and small images of the parts. When these are dropped onto a target, the dragged image is hidden and a layer containing the installed part is shown. What I would like is to have the dragged image always on top so that the layers with installed parts don't overlay and hide the image when it moves over them. I tried placing the draggable images on a new layer above the installed part layers but they still go behind the installed layers when dragged.
Is there a way to ensure that dragged images are always on top?