How do I Achieve this

Hello there, i was trying to make a fixed drag and drop into the box thing.. and i want when there's an object in the top of the box and i try to drag another object into the box the object that was in top of the box goes down smoothly, it's more like the Turbo Dismount combo thing.

I'm sorry i couldn't explain it more.

Here's the capx:

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1) Add Instance Variables to your Accepting box for the current number of blocks in the box and the maximum you can have.

2) on each "DROP" its full if not accept the next block.

3) foreach block in there check the Y (top) to the Accepting box Top * number of blocks in accepting box.

You should get the stacking you want.