Maximized Selected InternalFrame

Can't seem to get it to work. I'm sorry if this sounds like a newbie question. Here is my form class which just show and [supposed to, but not doing it] maximize Internal Frame.

Code:

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import javax.swing.*;
public class form {
       
        public static void showform(String title,
                        JInternalFrame child,
                        JDesktopPane parent){
               
                for(int i=0;i<parent.getAllFrames().length;i++){
                        JInternalFrame f=parent.getAllFrames()[i];
                        if(f.getName().equals(title)){
                                try{
                                        f.setMaximum(true);
                                        f.setSelected(true);
                                }
                                catch(Exception ex){
                                        JOptionPane.showMessageDialog(child,ex.getMessage());
                                }
                                return;
                        }
                }
                parent.add(child);
                try{
                        child.setMaximum(true);
                        child.setSelected(true);
                }
                catch(Exception ex){
                        JOptionPane.showMessageDialog(null,ex.getMessage());
                }
        }
}

---

and some use

Code:

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        void mnunatureofcollectionlist_actionPerformed(ActionEvent e){
                form.showform("frmnatureofcollectionlist",new frmnatureofcollectionlist(),desktop);
        }

---

Any suggestion? Thank you very much. :)

I thought you were suppose to throw a PropertyVetoExcetion when using maximize. If not, you can do it anyway and see if the problem is simply that the internal frame is rejecting the maximize property. I did read were some look and feels don't support the maximize property of the internal frame, but who knows.