combobox open and close on button rollOver

In combobox class there are methods like open() and close(), so we can use these methods to open the combobox list and close the combobox list.Here iam doing it on button rollOver.

<mx:ComboBox id="comboBox"
            openDuration="2000"
            closeDuration="1000">
        <mx:dataProvider>
            <mx:Array>
                <mx:Object label="one" />
                <mx:Object label="two" />
                <mx:Object label="three" />
                <mx:Object label="four" />
                <mx:Object label="five" />
                <mx:Object label="six" />
            </mx:Array>
        </mx:dataProvider>
    </mx:ComboBox>

<mx:Button label="open"
                rollOver="comboBox.open();"  -- combobox class method open()

enabled="false" />
        <mx:Button label="close"
                rollOver="comboBox.close();"  -- combobox class method open()  

              enabled="false" /> 

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