Listbox not losing selection

Hi all,
I have a dialog with many controls on it. One of this control is a Listbox and I noticed that when I move from a control to another one the selected item in the listbox remains highlighted. I tried the Listbox demo in the wx demos and I get the same behaviour, in this case there are three listboxes.
For some reason I'd need to control this and have the listbox to to turn off the highlight, so when the focus returns to the listbox the selection is still in place, or if not possible to lose the selection when the focus move to another control.
There's a way to do this easily? I plan to control the focus event but perhaps there's a more simple solution.

Thanks,
Enrico