customed look for button control

Hello there, i designed a button control (inherited from windows.forms.button) that has rounded corners, the problem is that when placing the button on an non-solid coloured background it appears as having sharp corners because i can't predict the exact color of the background pixels underneath the corner areas of the button.

What i would like to try do is to make a bitmap the size of my [button.bounds] from the background of the form containing my custom button, and use this bitmap as background for my button.

i figure this might be the sollution and i have no clue on how to achieve this, but if anyone has a better ideea please share it with me.

if all this is too confusing, here is how i begin drawing my button:

VB Code:

Protected Overrides Sub OnPaint(ByVal pe As System.Windows.Forms.PaintEventArgs)
        MyBase.OnPaint(pe)
 pe.Graphics.Clear(Parent.BackColor)

this works as long as i keep my forms simple, but at some points i have some forms that have a gradient-filled background (using paint event method).

got my dillema ?