Using editable JComboBox inside a JTable

Hello,
I have an editable JComboBox as editor for one row. I want to be able to tab into the cell and get the cursor inside the combo box. What I have to do now is double click after I tab. Is there a way to control, or maybe send an event so that it seems automatic? I was looking at PropertyChangeListener, but I'm not sure if I'm in the right track. Does anyone have any ideas, or examples?
I would REALLY appreciate it!!!
eli...

how to make a combobox enable in the header.please help me out..
selvas

This example should help you out. http://www2.gol.com/users/tame/swing/examples/JTableExamples9.html
eli

thanks a lot for eli.
selvas

hai eli,
thaks for the useful info.I am doing filtering in Jtable.
if the user selects from the combo which is in the header only
those info should display other rows should not be visible(similar to ms-excel).how is go about this please?
selvas

That link no longer exists - could be found here http://www.senun.com/Left/Programming/Java_old/Examples_swing/JTableExamples9.html