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Unselecting the option

I am trying to unselect the selected option using 'billablePartyId.unSelectOption();' but does not seem
to work.

Below is the code:

billablePartyId.clearAll();
billablePartyId.unSelectOption();
billablePartyId.loadXMLString(bpInXML);

Thanks for your help.

If you need to remove all options including selection and reload combo, you can use 
billablePartyId.clearAll(true); //parameter forces clearing of currently selected value
billablePartyId.loadXMLString(bpInXML);