Combo in calendar for year/month


I am using dhtmlx calendar in my application, I have set isYearEditable and isMonthEditable to true for calendar it is working fine but the problem is that user is not able to recognize that it is editable as due to its look, so can you please provide me the code which i can edit in js/css files to make month and year drop down as combo box, so that user can easily understand that he can change month/year by clicking on combos.

Please revert back ASAP, as i need to finalize things by tomorrow.

Thanks & Regards,