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I would have your OnEnter handler check CursorHasItem() and show the tooltip if you're not holding one. Additionally have onReceive() show the tooltip when it's done processing the cursor.
Alternatively, you can just let the tooltip show what the button is already set to and have onReceive() update it.
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WoWInterface AddOns
"All I want is a pretty girl, a decent meal, and the right to shoot lightning at fools."
-Anders (Dragon Age: Origins - Awakening)
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