How to display a tooltip with transparent background.

[sanjayamladi]

// The below code simply creates a black rectangular area for the tooltip
// Did I need to do any pinvike stuff to make the background tranparent.
// What am I really tring to acheive is Opacity of say 10% for the tooltip, so I can see the data on the grid the tooltip is covering.

private void hoverTooltip_Draw(object sender, DrawToolTipEventArgs e)
{    
    SolidBrush sb = new SolidBrush(Color.Transparent);            
    e.Graphics.FillRectangle( sb, e.Bounds );             
    e.DrawBorder();
    e.DrawText();                
}
 
 
private void BidGrid_MouseMove(object sender, MouseEventArgs e)
{
HoverToolTip.SetToolTip(sender, sb.ToString());
}