ComboboxExt with GridListControl

I am using ComboboxExt with GridListControl as its ListControl and PopupControl. I am trying to get the "best fit" behavior out of the combo. For instance, if you type in "M" in the Combobox, the item in the drop down list starting with "M" will be auto highlighted as it does from a Microsoft combobox dropdown. Currently, a syncfusion comboboxExt with multi-column drop down grid will auto fill itself in the text box but not highlighting anything from the drop down grid. Sometimes, even that doesnt happen. Do you know what I shall do to achieve the goal? Thanks. zheng

Can anyone please look at this and give me a confirmative answer? Any response is highly appreciated. zheng