Disable Double click for AW.Templates.Combo

We are using AW.Templates.Combo . In cases where the number of values in the combo are large(say exceeds 2000) , the combo gets stuck . This is happening especially on double click event of Combo. We tried disabling double click event and preventing its default behavior. But click (single click) event is getting called in case of "double click" event as well and we are unable to prevent the default "double click" behavior.

Can you please suggest how to disable double click for combo?