Thanks for the info. But I've noticed a little detail with this. This whole problem with the controls is happening to me with projects I did in Lazarus 1.4 and for some improvement perform Lazarus recompile with 1.6, from that recompilation such controls behaved that way. Now, I just started developing a new project with Lazarus 1.6 and I have placed these controls on a form and their behavior is correct encuanto to the position thereof with respect to the edit control, since not centered on screen .
The change from version 1.4 to 1.6 may have influenced somehow in such behavior?