如何使用jcheck框和多个选择创建jcombobox

I want to create JComboBox with checkboxes and multiple selection . i have created a list with check box after rendering the jlist . I dont know how to render it with jcombobox . Or is it possible to make jlist as drop down list like combo box . for jlist rendering i am using the following codeI want to create JComboBox with checkboxes and