Question resizing window form

[baby_girl]

i'm drawing a circle: DrawEllipse (50,50,480,480) .i need my circle to become bigger when i maximize (1288,778) the window form.my minimum form is (600,630) but when i use scaletransform (2,2,Drawing2D.MatrixOrder.Append),it become bigger,i also use tranlateform to center it (344,74,Drawing2D.MatrixOrder.Append).how to make the circle bigger and center when maximize it.tq