On Wed, Mar 19, 2008 at 5:50 AM, Aubanel MONNIER
>     repr->_setParent(father);

I think you need to use

parent->appendChild(child);

instead of this

> "change" value and reset the combo to no preset... So unless I mark
> somewhere (e.g. an ugly static flag) the change comes from the preset combo
> and check when I come back and do nothing in this case, I need to find
> another way.


Well, all the controls in the bar have their callbacks - so you can
just add a call like update_presets_list to each such callback.

By the way, please make sure that presets store not only numeric
params but also the boolean state of the buttons such as use pressure
sensitivity and trace background. It's an important part of the tool
behavior as well.