Jose,

>I want to change the behaviour of all my combobox. I want that after the user selects an option, the focus is given to the next control.

You may want to think twice before changing this behavior...good, bad or indifferent, it is standard Windows behavior for a combobox to keep focus after an item has been selected. Just be aware that changing the behavior of controls in your application in this way may throw your users a curve (a small one admittedly <s>).

Regards,