How can i populate the JComboBox upon mouse pressed on it?

I have a question i don't know if this possible in swing.
The question goes like this.
I have three comboboxes (grand parent -> parent -> child) on Jtable this table has multiple rows from DB. I have to also explain the design before i go and present question. The grand parent combo box is the only one with multiple values in it (when the table is loaded) the parent and child comboboxes are initialized with one null value in it this was done by turning text field into combo box and populate with null array list. This is how it was done all of this done on initial table loading.
Now working Scenario I:
If user click on grand parent and choose a value then parent combo gets updated and same with child combo....this works fine.
Issue i am having with Scenario:
The issue is when a user click on parent or child then the respective combo box gets the related values and populate into the same combobox that the user has just clicked on. I wrote an event mouse pressed on these combo box and this fetches the values from the linked list and prints but not showing up in the combo box.
Is there something i am doing wrong?
Thanks in advance.

I figured out the solution myself.
Thanks

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