Combobox in jtable two tab problem

[Anuradha Saravanamuthu]

Hi all,
If i am using combobox for one of the columns of jtable with custom editor and renderer, it needs two tab for navigation between the cells.
How can i make it as 'one tab navigation'. Even i tried with 'isManagingfocus() return true' but...no effect.
thanx in advance.