How to define a new rectangle or region to ToolTip control?

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C#2.0

C#

After setting "OwnerDraw" property as "true" and later using Draw event handler we can draw custom shapes or strings but I wanted to know how can we set the rectangle or region of that tooltip so that the objects or shapes(like ellipse or pie or other shapes) get fit in it.

I tried like adding such code:

private void toolTip1_Draw(object sender, DrawToolTipEventArgs e)
        {
            e.Graphics.FillPie(Brushes.Green, new Rectangle(0, 0, 30, 30), 0, 120);
        }

but this code works only if I add spaces or lines in the tooltip text so that to extend the region of tooltip. For the same I added :

private void Form1_MouseHover(object sender, EventArgs e)
        {
            toolTip1.Show("                              \n\n\n", this);
        }

So I don't feel this as efficient solution to extend region. Is there any other way I could extend the rectangle or region of the tooltip? Moreover extending region this way won't help in having accurate spaces in various drawing performed on it.