sure, i have it the other way around (plus parents pane as a second tab on the search pane).
drag the search pane and you will see the 4 arrows cross when you go over data explorer pane, release the left mouse button while being over the "down" arrow in the cross.
you can play with that and see how it works, when you release it while being in the middle of the cross, the pane will become a tab of the underlying pane
|