Do you mean this:

var loc = lbl.Parent.PointToScreen( this.Location );

That doesn't work, either, and leads to inconsistent results. When the form is maximized, it shows in approximately the same position as before, but off to the left (I have it maximized on my right-hand monitor). If the form is not maximized, it ends up somewhat near the middle of the form.

The x-coordinate that you're passing in is where the label begins, so I would think that it's correct that it's shown to the left of the 9; if you want it to be positioned farther to the right, you would have to adjust the x position accordingly.  

I also just noticed something with your code that I hadn't noticed initially: you're adding the height of the label to the y-coordinate of the location you're showing the ToolTip.  Without doing this, my initial suggestion of lbl.Parent.PointToScreen(lbl.Location) works.

-Matt

The screen shot in my last response shows it without the label's height being added to the y-coordinate, and it's still too high. Adding the y-coordinate is what I did on the simple form I copied it from, so the tool tip notification popped up below the control.

Oh, misread that part.  My test was also set too high if I used the DockableWindow (without adding the Height to the y-coordinate).  If I used lbl.Parent.PointToScreen(lbl.Location) and used the result directly, the tooltip was displayed correctly:

var loc = lbl.Parent.PointToScreen(lbl.Location);
tt.Show(new Point(loc.X, loc.Y));

-Matt

Thanks, that worked. For anyone who runs into this, here's the corrected code (at least for this circumstance):

        private void link_MouseHover( object sender, EventArgs e ) {
            var lbl = (UltraFormattedLinkLabel) sender;
            var ui = lbl.UIElement.GetDescendant( typeof( FormattedLinkEmbeddableUIElement ) ) as FormattedLinkEmbeddableUIElement;
            if( ui == null || ui.IsDataFullyVisible )
                return;
            var tt = new ToolTip( lbl ) {
                                            DisplayStyle = ToolTipDisplayStyle.BalloonTip,
                                            ToolTipText = lbl.Value.ToString( )
                                        };
            var loc = lbl.Parent.PointToScreen( lbl.Location );
             tt.Show( new Point( loc.X, loc.Y ) );
        }