Keyboard Access For a Column in JTable with default editor as JComboBox

I want to get Key board access for a column in JTable.
The user should be able to select from a drop down list for the column with default
editor set as JComboBox.
Presently,it works fine with mouse,also I am able to focus it with Keyboard using
ALT+Up keys,but how to make drop down list appear.
Plz help,it's urgent.
Thanks in Advance

Hi,
In addition to setting DO_SUM = 'X' you need to specify function in H_FTYPE field. It should be set to 'AVG' in your case.
ls_fielcat-do_sum = 'X'.
ls_fieldcat-h_ftype = 'AVG.

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