ExtJS Combo With Checkbox

I want to design Combobox with Checkboxes(inside ,along with data) What is tha best way to do it For using lovcombo, which files i have to add and how to download those files. (my requirment is select multiple fields from combo, need not to show selected values as combo select text)

Please help me

Thanks开发者_如何学JAVA in advance

you will find a good example here how to implement it.

Multi select combobox extension