<Composite ...>
<ToolBar x:style="SWT.NONE" x:Class="MyToolbar">
  <ToolItem x:style="SWT.PUSH" text="A" selectionEvent="onSelectionA">
  </ToolItem>
  <ToolItem x:style="SWT.PUSH" text="B" ></ToolItem>
</ToolBar>

public class MyToolbar extends XWTStaticPart {	
  public void onSelectionA(Object object, Event event) {		
    // ...
  }
}

<Composite x:Class="MyView">
  <ToolBar >
    <ToolItem x:name="Name1" x:style="SWT.PUSH" ></ToolItem>
  </ToolBar>
</Composite>

public void onSelection(Object object, Event event) {
  Object name1 = XWT.findElementByName( event.widget, "Name1");
  if (w != null && w instanceof ToolItem ) {
    System.out.println("NAME1 OK");
  } 
}