JTable - URGENT !!!!

[Nidhi Madan]

Hi everyone,
I am trying to set a JComboBox in a Table cell using setDefaultCellEditor and it is setting too but the JComboBox is not visible when i add a row, but once clicks on that cell it becomes visible.
Can anybody help in telling how to make that visible.
I am using the folloeing code:
TableColumn.setCellEditor(new DefaultTableCellEditor(JComboBox));
do i require to set some other properties of this combobox. this is a non-editable combobox.
i need on more help : i have added three text feilds to a pannel, now i wish to add that pannel to a table cell. is there any way to do it as DefaultTableCellEditor()constructor allows only JTextFeilds,JcheckBox.
please help me as soon as possible.
Thanks
Nidhi Madan