ComboBox set width problem

Hey all,
Has anyone experienced this, when i give a preferred width to my comboBox, and i use it for the first time, the drop down is still the same size.
When the comboBox is again pressed, the dropdown comes with the given size.
Please see the link for demo image :
[http://s13.postimg.org/6954yibvr/Error.jpg]
Regards,
Abhi

The ComboBox tutorial example with setPrefWidth() works as expected.
http://docs.oracle.com/javafx/2/ui_controls/combo-box.htm#BABJCCIB
Please post your code which shows your issue.

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