hey guys,im a using Opengl with C# (Tao Framework), im a making a simple coloring book,so far so good,but when i do actually "color" the scene is the problem
see i have three circles,i colored the first one,no problem,but when i color the second,the 1st on returns to white!

i thought i could attach each circle to its own color,but thats not generic,what i need is to save the whole scene,instead of re-drawing it every time

is there something like pushmatrix,popmatrix but whith scenes?

please help
thanks in advance

No, you need to store all your scene information yourself and redraw it each frame.

When the user is drawing, save the data from every frame. When they finish a stroke, redraw it all to the buffer and store it in a pixmap. Redraw the pixmap under everything else. Repeat as necessary.