Drop Down Menu Issue

I am totaly new in GWT desining and implementation. I created a a drop down menubar where number of items are displaying in the drop down menu  But it is not closing automatically if I am not selecting anyone (That means there is no auto close option like autoOpen). So is there any one who can guide me, how to implement a logic to make it auto close ?.

Thanks & Regards

Ajit Kumar Pradhan

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