set current item for pickers

[LinArcX]

Hello. I have two pickers, A and B. I select an item from A, (lets say third item) and call picker B. I come back to A and want to set the current item to third item. But i don't have any idea how do the last part. Any idea?

[Shougo]

Hm. It is hard to understand.
More specific example is needed.