如何使用JDialog中的组合框更新JTable

i have created a window that includes a jtable that is populated with mysql data. there is also a button 'LOAD TABLES' when clicked a Jdialog pops up letting the users to chose another table from the JComboBox! everything works pretty fine but the problem is when a table is chosen from JComboBox and clicking the Jdialog OK button the JTable is not loading the data from the new table (Not refreshing)!! Below is simplified code!!i have created a window that includes a jtable