Java SE (Java Platform, Standard Edition)

Hi,

I have several forms under my MDI application. I'm able to open those forms from MDI menu bar using following code

    private void miUpdate_accountsActionPerformed(java.awt.event.ActionEvent evt) {                                                  
        UpdateAccount updateaccount = new UpdateAccount();
        updateaccount.setVisible(true);
        desktopPane.add(updateaccount);
    }

but I'm unable to use this code the same way to open these from one another.

for example I have a form which lists all the rates, then I wann click on one rate and open another form where I can edit that rate. The forms are there working fine, but How to open one internalFrame from another?