Move two splitters in same time

hi all,
here is my problem: in the attached VI, when the right splitter is moved, I want that the left splitter follows the right splitter. since there is not event for drag-drop splitter, i have no idea to do that. any suggestions?
Cedric
Attachments:
two-splitter.vi ‏10 KB

There are mouse down and mouse up events. As well as mouse leave for the splitters.
You should be able to work with them to determine if a drag has occurred.

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