NetBeans Matisse - Access jframe component from another class

The Matisse code from Netbeans is blocked. The problem I have is that I have to setBackground to a JLabel from another Class in different package but I cannot do this because i have no access to the JLabel due to its private and blocked code.

Is thare any solution to this?

"The Matisse code from Netbeans is blocked"

You can edit it as seen here

"because i have no access to the JLabel due to its private and blocked code"

Just write a getter method for the label in the other class

public class OtherClass .. {
    private JLabel jLabel1;

    public JLabel getLabel() {
        return jLabel1;
    }
}

import otherpackage.OtherClass;

public class MainFrame extends JFrame {
    private OtherClass otherClass;
    ...
    private void jButtonActionPerformed(ActionEvent e) {
         JLabel label = otherClass.getLabel();
         label.setBackground(...)
    }
}

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"Access jframe component from another class"

Sounds like you're using multiple frames. See The Use of Multiple JFrames, Good/Bad Practice?

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UPDATE

" I have a MAIN frame made in matisse but due to some reasons i have to set the background of an textField inside matisse from another class when X validation happens in the other class"

What you can do then is pass a reference of the Main frame to the other class, and have a setter in the Main frame. Something like (I will provide an interface for access)

public interface Gettable {
    public void setLabelBackground(Color color);
}

public class Main extends JFrame implements Gettable {
    private JLabel jLabel1;
    private OtherPanel otherPanel;

    public void initComponents() {
        otherPanel = new OtherPanel(Main.this); // see link above to edit this area
    }

    @Override
    public void setLabelBackground(Color color) {
        jLabel1.setBackground(color);
    }
}

public class OtherPanel extends JPanel {
    private Gettable gettable;

    public OtherPanel(Gettable gettable) {
        this.gettable = gettable;
    }

    private void jButtonActionPerformed(ActionEvent e) {
        gettable.setLabelBackground(Color.RED);
    }
}