C#

Bitmap b1 = new Bitmap(256, 256);
Bitmap b2 = new Bitmap(256, 256);
Bitmap final = new Bitmap(256, 256);
Graphics g = Graphics.FromImage(b1);
g.DrawRectangle(Pens.Red, 0, 0, 150, 150);
g.Dispose();
g = Graphics.FromImage(b2);
g.DrawEllipse(Pens.Black, 100, 100, 50, 50);
g.Dispose();
g = Graphics.FromImage(final);
g.DrawImage(b1, new Point(0, 0)); // Delete this line if you dont want to draw b1 image
g.DrawImage(b2, new Point(0, 0));
g.Dispose();
pictureBox1.BackgroundImage = final;

kanchoette wrote:

...bound to a checkbox control

kanchoette wrote:

...set the boolean to false for all other rows.

Megidolaon wrote:

I added a ScrollBar to the control and to the Controls property of the Panel.

Megidolaon wrote:

I thought of clearing the Controls property of the Panel and always just adding the visible PictureBoxes (they all are stored in an extra collection), determining which ones are visible by Panel and PictureBox size.Though, this would need calculations and have to be pixel-exact, if possible I dould like to avoid this and use a more elegant way.

g.DrawImage(resource, new Rectangle(0, 0, 32, 32), 
   new Rectangle(32 * i, 32 * k, 32, 32), GraphicsUnit.Pixel);