dhtmlxCombo lost focus onClick

when I click an option on dhtmlxCombo, the focus of the combo is lost. It’s my code fault or the combo is intended to be like that?
Can I get a hand of this problem?

sorry for asking this simple question and my bad English, I’m new in dhtmlx and I’ve search the forum for this but can not find a solution.

Thank you.

Are you using the latest version ? We have not reproduced the problem locally with it. Can we reproduce the problem in the sample from Combo package ?