WebCore / TTMSFNCControlPicker / AutoCloseUp property


I have ControlPicker with a WebScrollBox and some nested controls inside of it.
How should the AutoCloseUp property of the control picker work?
When I have it opened and then I click on something outside of the picker, the first click just closes the picker, and only then the other controls are able to respond to clicks.
For example, if I have the control picker opened, and click on an outside Button, I must click twice to make it work. 1st clicke hides the control picker, 2nd click fires the button OnClick.

If it doesn't have anything to do with AutoCloseUp property, what can I do to make picker close up and outside clicks respond on the 1st click ?