Dear Farrukh

I tried your code, but the problem was not reproduced.
I can save the canvas as attached without crash.

Only the difference from your code is the histograms.
Since I don't have your task I took and draw 'ADC' histograms from 'FillHistogram' task.
No other changes were made from your code.
I edited .h file of the tab from the automatically generated ones.

Ryu



> Dear Colleagues 
> 
> we have implemented in one of our tabs a button to call a function which saves a 
> canvas to a pdf file with a time date stamp.
> 
> 1) This works fine when there is only one histogram on the canvas and this code 
> is MIDTBCTab.cpp (attached)
> 
> 2) When the canvas is divided up into a 5x11 pads with 55 histograms and 
> we want to save the _whole_ canvas with the whole picture (_not_ any individual 
> pads) the code crashes  and no file is generated - the tab code is MIDTRCTab.cpp
> and this is also attached 
> 
> I am wondering what is going on - is there anything obviously wrong ?
> 
> many thanks 
> 
> Farrukh