custom function doesn't work, but gieves no error...

Hi! Now that I got all the details straight, I can attack the main feature of the software I'm designing. I want to draw a rectangle on the "main" form, when a button is clicked on the frm. I have this function in a module:

VB Code:

Public Function drawDesignArea()
 
        Dim myGraphics As Graphics
        Dim myRectangle As Rectangle
        Dim myPen As New Pen(Color.Red)
 
 
        main.Height = 100
        myGraphics = Graphics.FromHwnd(hwnd:=main.Handle)
 
        myRectangle = New Rectangle(x:=5, y:=5, Width:=10, Height:=40)
 
        myGraphics.DrawRectangle(Pen:=myPen, rect:=myRectangle)
 
    End Function

and I call it when the button on the "wizard" form is pressed. But nothing happens. The rectangle doesnt draw, neither does the form resize to height =100... The "main" form is the drawing surface, but I need some setting (i.e. the size of the rectangle to draw, and other settings), and I'm using a wizard for this. Thats why I want to call the function from another form where it is meant to draw. I hope I made myself clear. Thank you in advance!¸
Jean Christophe Avard