WinForm margin borders problem

Hi. I am trying to implement my user control which inherits
Windows.Forms and I want to make it skinnable. So I use
BorderStyle.None on the form and I will draw the borders and title
bar. But in this case if I add menu it must be offseted from the top
by the height of my skinnable title bar. How can I achieve that.
How I can set som borders of the form where all the controls can be
drawned and the rest I will draw myself( ie the borders and title
bar). I tried to set the DockPadding.Top property to 20 for example
but the menu is not padded. It seems that it is not docked to the top
of the form , but it uses some other way to bound to the top. Can I
make the menu to appear for example 20 pixels padded from the top?

Thanks in advance.