How can I have acces to a component of a window from a menu

Question

In a JInternalFrame, I have one Button.
I try to access to this Button from a ActionListener of a JMenuBar.
In the ActionListener of the JMenuBar, I have use the function "MyActiveFrame = MyDesktop.getSelectedFrame();" for having a pointer to my JInternalFrame.
But I don't arrive to access to a component of my JInternalFrame.
I have try "Button Boutton1 = MyDesktop.Boutton1;" but that don't work. It always say :
     java:56: cannot resolve symbol
     symbol : variable Boutton1
     location: class javax.swing.JDesktopPane
                    Button Boutton1 = MyDesktop.Boutton1;
^
Is someone can tell my how I can have acces of this Button (and to the others component of my JInternalFrame from my JMenuBar).
dank you in advance.

Answer 1

No, that's not the problem. The problem is:
    JInternalFrame MyActiveFrame;
    MyActiveFrame = MyDesktop.getSelectedFrame();
    Button Boutton1 = MyActiveFrame.Boutton1;You are declaring MyActiveFrame as a JInternalFrame, not as the class you defined that extends JInternalFrame. Since JInternalFrame has no member named Boutton1, then MyActiveFrame.Boutton1 will cause the error.
For example:
    public class MyFrame extends JInternalFrame {
        public Button Boutton1 = ...;
    };If you did something like:
    JInternalFrame frame = getOneOfMyFrames();
    Button b = frame.Boutton1;You would get an error. You need to do:
    MyFrame frame = getOneOfMyFrames();
    Button b = frame.Boutton1;Know what I mean?
Jason