[Dev-C++] restoring window

[Vlada D. <dj...@im...>]

Hello, list
I wrote a program for drawing in a window( nothing special, just colord
lines). It works fine, but, when I minimize the window, and then restore
it, the lines are gone. I suppose that when I restore the window from
minimized state, a WM_PAINT message is posted. Is this correct? Is there
some API function which can restore the contents of the window in
response to this message or I have to do it myself?