package helloWorld;

import java.net.URL;

import org.eclipse.e4.xwt.IConstants;
import org.eclipse.e4.xwt.XWT;

public class Main {
	private static TestMe testme = new TestMe();
	
	public static void main(String args[]) throws Exception {
		URL url = TestMe.class.getResource(TestMe.class.getSimpleName()
				+ IConstants.XWT_EXTENSION_SUFFIX);
		XWT.open(url,testme);
	}
	
	
}

package helloWorld;
import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;

import org.eclipse.swt.widgets.Event;


public class TestMe {

	private String testText;
	
	private PropertyChangeSupport support = new PropertyChangeSupport(this);
	
	public void addPropertyChangeListener(String propertyName,PropertyChangeListener listener) {
		support.addPropertyChangeListener(propertyName, listener);
	}
	
	public void removePropertyChangeListener(String propertyName,PropertyChangeListener listener) {
		support.removePropertyChangeListener(listener);
	}

	public TestMe() {
		setTestText("This is a Test");
	}
	
	public String getTestText() {
		return testText;
	}

	public void setTestText(String testText) {
		support.firePropertyChange("testText", this.testText, testText);
		this.testText = testText;
	}

	public void onSelection(Event event) {
		System.out.println(testText);
		setTestText("Hello World");
	}

}

<Composite xmlns="http://www.eclipse.org/xwt/presentation" 
		   xmlns:x="http://www.eclipse.org/xwt"
		   xmlns:y="clr-namespace:helloWorld"
		   x:Class="helloWorld.TestMe">
	
	<Composite.layout>
		<RowLayout/>
	</Composite.layout>
	
	<Text x:Style="BORDER" text="{Binding path=testText}"/>
	
	<Button text="New Button" SelectionEvent="onSelection"/>
</Composite>