How to add Combo (SWT) to my NormalizationNodeDialog?

Node Development
1

I decided to try to create my own node on Java language. I don’t understand how to properly add Combo (SWT) to my NormalizationNodeDialog.

Add this:
Display display = new Display();
Shell shell = new Shell(display);
RowLayout rowLayout = new RowLayout();
rowLayout.marginLeft = 10;
rowLayout.marginTop = 10;
shell.setLayout(rowLayout);
Label label = new Label(shell,SWT.NONE );
label.setText(“Select language:”);
Combo combo = new Combo(shell, SWT.DROP_DOWN);
String[ ] items = new String[ ] { “English”, “Vietnamese” };
combo.setItems(items);

Add here:
public class NormalizationNodeDialog extends DefaultNodeSettingsPane {
protected NormalizationNodeDialog() {
super();
…
}
}

Please, help me.