How to udate an image using on_expose_event()?

["MERT TUGCU" <merttugcu hotmail com>]

Hi,

I am a little bit new to gtkmm. In my application I need to display an image 
which is stored in a memory buffer. I checked the drawing area example in 
the tutorial but it didn't help.  I have three drawing areas in my 
application to display three different images. My question is how can I 
redraw an image that is stored in memory when something gets on top of it or 
the UI is minimized etc.  The prototype for the function is:
virtual bool on_expose_event(GdkEventExpose* e); and I couldn't figure out 
how to pass a pointer, that points to an image, to this function.