How to add Text to annotation of ColorLineTool

[X-ray]

Hello TeeChart Team,

How can I add (prefix) some text to the numerical output (Annotation) shown of the TColorLineTool?
I tried to change the Text in the OnDragLine Event like:

procedure TfrmXYPlot.XYLimitDragLine(Sender: TColorLineTool);
begin
Sender.Annotation.Text := 'XY Limit: ' + Sender.Value.ToString;
end;

But that text doesn't show up?

ColorLineToolAnnotation.png (72.55 KiB) Viewed 111 times

Best regards,

Thomas