How do you allow one component at a time in the GUI to be selected?

I have a tree and a combo box in my GUI. Does any one know of a method or way to allow the selection of one component at a time in the GUI only?
For example, if i selected a node in the tree (it becomes highlighted), then made a choice from the combo box...I would like the node in the tree to be deselected.
Thanks!!!

Yeah add a focuslistener to everything and on focuslost clear the selection

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