<html><div style='background-color:'><DIV> <P>Hi André,</P> <P>I know the double buffering technic but as you, I don't know if it's possible to use it in Dr. Scheme.</P> <P>My problem seams to be caused by the clearing of the entire windows (or canvas) just before drawing the updated bitmap.  I tried just to redraw the updated section of the canvas but because I need to send a refresh command to the canvas to see the new bitmap, the whole windows is cleared and then the flickering occurs...  I didn't find anything on windows refreshing or something connected to it.  I just hope that the problem is not caused by XP.</P> <P>Thanks again!<BR><BR>Francis</P></DIV> <DIV></DIV> <DIV></DIV> <DIV></DIV></div><br clear=all><hr>MSN Messenger : discutez en direct avec vos amis ! <a href="http://g.msn.com/8HMFFR/2015">Cliquez-ici</a> </html>