Picturebox resize rectangles/ellipse in a group

I got a question about resizing in a picturebox.

I got a paint program where i can make rectangles and ellipse and also i can make a group of rectanges/ellipse.

My problem is when i want to resize a group all the objects also need to be resized(those objects got variables PointF, SizeF).

So can anyone help me with this problem?

ps sorry i cant post images.