How I set the Focus in object

Question

Hello.
I need set the focus on first object in a JInternalFrame.
The form JInternalFrame contain a JTabbedPanel and this include object jFormatedTextFields.
I need when the init form set the focus over first object in the first tab of JTabbedPanel. How I do?.
Than You

Answer 1

works OK in this
(tabbed panes seem to be working OK for focus now, don't know what's changed)
import javax.swing.*;
import java.awt.*;
import  javax.swing.text.*;
class Testing extends JFrame
  MaskFormatter mf;
  JFormattedTextField ftf;
  public Testing()
    setLocation(300,200);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    try{mf = new  MaskFormatter("###.###.##.##");}
    catch(Exception e){e.printStackTrace();}
    ftf = new JFormattedTextField(mf);
    JTabbedPane tp = new JTabbedPane();
    tp.addTab("A",ftf);
    JDesktopPane dp = new JDesktopPane();
    JInternalFrame if1 = new JInternalFrame( "I-F1", true, true, true, true );
    if1.setLocation(50,50);
    if1.getContentPane().add(tp);
    if1.pack();
    if1.setVisible(true);
    dp.add(if1);
    getContentPane().add(dp);
    setSize(400,300);
    setVisible(true);
    ftf.requestFocusInWindow();
  public static void main(String[] args){new Testing();}
}