Drawing Inside a Panel

Drawing Inside a Panel

I've seen this asked a lot on this site and others, but I've yet to find a
answer. What I'm trying to do is draw a series of rectangles roughly 10x10
in size on a click. So I have a button, when I click it, it will create a
rectangle inside my panel using
xgraphics = pnlContainer.CreateGraphics();
xgraphics.FillRectangle(new SolidBrush(Color.Red), xAxis, yAxis, 10, 10);
pnlContainer.AutoScrollPosition = new
Point(Convert.ToInt32(xAxis),Convert.ToInt32(yAxis));
yAxis += 10;
It creates the rectangle then moves down, on the next click it creates
another rectangle but now it's lower and so on and so forth. I'm utilizing
a trick I read on here on how to get the panel to scroll by putting a
panel inside a panel with autoscoll on and raise the height on the inner
panel when you get to the bottom. It works great HOWEVER!!!! when the
panel scrollbar appears it clears all of my graphics.
I read that I counter this to use invalidate(); But when I do this it
throws an error that graphics cannot be converted into a rectangle. so
what the F???
I seen on MSDN that I could do this:
private void Form1_Paint(object sender,
System.Windows.Forms.PaintEventArgs e)
{
// Draw the rectangle...
e.Graphics.DrawRectangle(new Pen(Color.Blue, PenWidth), RcDraw);
}
However, this creates a rectangle using the mouse, which wont work in my
situation. In a nutshell I need to be able to create a rectangle in a
panel that when it gets to the bottom it then will allow you to scroll and
add more rectangles to it... It doesn't sound that hard, but I'm missing
something fundamental or something and it's really starting to grind my
gears! Please Help!