root GUI

I am trying to use to write standalone code with root GUI classes (TGxxxx).

I try to add/delete/modify windows dynamically, e.g. when run starts,stop.

It sometimes works, but quite often it crashes, see output pasted after email.

My questions are following:

• is there somewhere example of gui with similar functionality ?
• is there other documentation apart from ftp://root.cern.ch/root/doc/25WritingGUI.pdf ?
• how can I debug errors a la bad windows ?

Thanks,
Roman.

""
Starting DisplaySCAL for run: 113081
fInputs=0x9e99ca8
Cleanup ok
fComp added
Warning in <TCanvas::ResizePad>: fRootEmbeddedCanvas19_canvas width changed from 0 to 10

Warning in <TCanvas::ResizePad>: fRootEmbeddedCanvas19_canvas height changed from 0 to 10

Inputs added
run 113081 adding cluster 0
Error in <RootX11ErrorHandler>: BadWindow (invalid Window parameter) (XID: 10486057, XREQ: 40)
"" Received on Mon Apr 12 2010 - 07:36:55 CEST