I found one problem: You have a wrong connection (Rt is very quiet about connection errors). You need to change: Connect("OnMouseOver(Int_t)", "MapTest", this, "DoOverRegion(Int_t)"); Connect("DoubleClicked()", "MapTest", this, "DoMapClicked()"); to: fImageMap->Connect("OnMouseOver(Int_t)", "MapTest", this, "DoOverRegion(Int_t)"); fImageMap->Connect("DoubleClicked()", "MapTest", this, "DoMapClicked()"); However, the OnMouseOver(Int_t) signal still doesn't get to its handler. I don't know why. -Brett.
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