I wrote a program to display some graphs on a PictureBox using Graphics functions from VB.Net
The graph displays nicely, but it seems to have a little problem
Everytime I minimize the program or having another window cover the graph (even partialy), the graph's portion that has been covered is gone!!! (when minimize, all graph is gone)!!!
I would like to know what is the problem and how to solve it
(it is not related to focus, if another window is selected, as long i don't cover the graph, it stays there)