Flash Player above 7: Tutor of Window Actionscript in flash using Swapdepth

Create a Box Button. Again Convert this button to MovieClip.
Now create multi instance of this MovieClip in the stage and name the instance of the each MovieClip like source_mc,source1_mc,source2_mc.
Select the button to write the actionscript by, RightClicking the MovieClip > 'Edit in place', select the button press F9.

Add the code:

1. on (press, dragOver) {
2. this.startDrag();
3. this.swapDepths(this.getNextHighestDepth());
4. }
5. on (release, dragOut) {
6. this.stopDrag();
7. }
   
   Here we are changing the swapDepths by getting the HighestDepth in the Stage.
   Due the multi instance every movieclip has the same function.