I have a simple program whose main form is an SDI. I have a couple of progress bars on the form plus a timer. They show the progress of a lengthy process (a lot of disk i/o). The form displays everything correctly except that once it lost focus (e.g., I switch to another window then come back), the entire form went blank (after a few seconds). It never recovers until the entire process is finished.
I've trapped the Paint() event handler of the form and it turns out that once the form goes blank, the Paint() event (as well as all other event handlers) is no longer invoked. Note that the process (disk i/o's etc.) is still running, just all GUI of the form becomes inactive until all process is done and the form comes back to wait for the user input.
Any ideas?
