[Lazarus] Trackbar - how go to mouse click position?

[Felipe Monteiro de Carvalho]

The exact behavior of native controls is controlled by the backend
library (in this case Gtk), not Lazarus.

You can use a non-native control. Install the package located at
lazarus/components/customdrawn and use the control TCDTrackBar and it
will go to where you clicked. I think this requires Lazarus 1.1+

-- 
Felipe Monteiro de Carvalho