import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.List;

public class listfailure {

	protected Shell shell;
	private Text txtText;

	public static void main(String[] args) {
		try {
			listfailure window = new listfailure();
			window.open();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

		public void open() {
		Display display = Display.getDefault();
		createContents();
		shell.open();
		shell.layout();
		while (!shell.isDisposed()) {
			if (!display.readAndDispatch()) {
				display.sleep();
			}
		}
	}

	protected void createContents() {
		shell = new Shell();
		shell.setSize(450, 300);
		shell.setText("SWT Application");
		
		txtText = new Text(shell, SWT.BORDER);
		txtText.setText("text1");
		txtText.setBounds(41, 46, 76, 21);
		
		Button btnTest = new Button(shell, SWT.NONE);
		btnTest.setBounds(42, 93, 75, 25);
		btnTest.setText("New Button");
		btnTest.addListener(SWT.Selection, new Listener() {
		      public void handleEvent(Event e) {
		        switch (e.type) {
		        case SWT.Selection:
		        	changestuff();
		          break;
		        }
		      }
		    });
		
		List list1 = new List(shell, SWT.BORDER);
		list1.setBounds(41, 148, 71, 68);
		list1.add("Add1");
	}
	
	void changestuff() {
	  txtText.setText("Retext");
	  list1.add("Add1");               //ERROR = list1 cannot be resolved
	}
}