Hello! I am writing a turtle graphics program in Haskell. Now, I am working on the GUI (Gtk2HS). I am a newbie, I have never programmed event driven systems. I have a Button, and when it is clicked the code written in a a TextView is drawn in a DrawingArea. There are some problems: when "Expose event" happens (I dont really know, if I use the right words, but I mean, when another window is in focus, or another window comes before the turtle graphics window etc.) my drawing disappears (I know, it is the normal behaviour). I would like to redraw it, but I dont know, how. I have a function with events... connectGui gui = do onDestroy (mainWin gui) mainQuit onClicked (btn gui) (drawProgram gui) afterActivateLeaf (quitbtn gui) (widgetDestroy (mainWin gui)) (where gui is a record, containing all the GUI elements, such as the buttons) ...but the drawProgram function draws everything, and if I add the "onExpose" with the same drawing function, everything is redrawn although the Button was never clicked before. So I would like to modify the code: -if the button was already clicked and redraw is needed, then it should be done -if the button was never clicked, then there must be no redraw Could you tell me, how can I do this? Gabre