Many Drags from same grid

Vaadin 6 / 7 / 8
1

Hello
I need to handle both rows reordering and drag&drop to other grid B, on the same grid A.
Following tutorial and documentation, I set two GridRowDragger this way:

GridRowDragger<SignFieldEnum> reorder = new GridRowDragger<>(destGrid);
reorder.getGridDropTarget().setDropEffect(DropEffect.MOVE);
GridRowDragger<SignFieldEnum> selectToAvail = new GridRowDragger<>(destGrid, sourceGrid, DropMode.ON_GRID);
selectToAvail.getGridDragSource().setEffectAllowed(EffectAllowed.MOVE);

This doesn’t work, and break the grid when I start a drag.
It’s seem not possible to add two GridDragSource on the same Grid, isn’t it?

Someone know a good solution?

Thank you.