Hi ROOTERS, I have developed a GUI with several TGCanvas's and TRootEmbeddedCanvas's. I wish to keep the user from drawing in these canvases with the TBrowser or TTree viewer. I have removed the TCanvas's from gROOT->GetListOfCanvases(), but this does not keep the TBrowser or TTree viewer from drawing onto the TGCanvas and TRootEmbeddedCanvas's. If I set TCanvas::SetEditable(kFALSE) on each canvas, I get a segmentation violation when I try to draw from the TTree viewer whereas I expected a new TCanvas (separate from the GUI) to automatically popup. To avoid this problem, I must create an active canvas outside the GUI. Is there a way I can prevent the canvases inside the GUI from being drawn to by the TBrowser and TTree viewer and have the TBrowser and TTree viewer automatically create a canvas if needed (i.e., only in cases where there is not already an active canvas outside the GUI)? Thanks for your help, Glen
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