ToolTip arrow pointing the wrong way

Hi, all,
I'm trying to have a click event show the tooltip for a control (we all know how frustrating it is when mouseover doesn't fire one, so I'm adding a backup).
I figured out how to show the tooltip, but, if I click it several times, it goes about half and half between pointing the arrow up (into the clear blue sky/desktop) or down (at the control).
 
Here's the click handler:
private void pbHelpBlah_Click(object sender, EventArgs e)
{
ttBlah.Show(Globals.blahToolTip, this, pbHelpBlah.Location.X, pbHelpBlah.Location.Y - 95, 2500);
}
 
I thought I might have to *shudder* ownerdraw it?  Any advice on how I would do that with a balloon?