<menuContribution
        allPopups="false"
        locationURI="toolbar:test.ui.views.MyView">
     <command
           commandId="test.ui.commands.Command1"
           icon="icons/Command1.png"
           id="test.ui.commands.Command1.dropdown"
           label="Command 1"
           style="pulldown">
     </command>
  </menuContribution>

  <menuContribution
        allPopups="false"
        locationURI="menu:test.ui.commands.Command1.dropdown">
     <command
           commandId="test.ui.commands.Command2"
           label="Command 2"
           style="push">
     </command>
     <command
           commandId="test.ui.commands.Command3"
           label="Command 3"
           style="push">
     </command>
  </menuContribution>

// Sanity check.
if ( null == event ) {
    return null;
}

// Class check.
if ( ! ( event.getTrigger() instanceof Event ) ) {
    return null;
}

Event eventWidget = (Event)event.getTrigger();

// Makes sure event came from a ToolItem.
if ( ! ( eventWidget.widget instanceof ToolItem ) ) {
    return null;
}

ToolItem toolItem = (ToolItem)eventWidget.widget;

// Creates fake selection event.
Event newEvent = new Event();
newEvent.button = 1;
newEvent.widget = toolItem;
newEvent.detail = SWT.ARROW;
newEvent.x = toolItem.getBounds().x;
newEvent.y = toolItem.getBounds().y + toolItem.getBounds().height;

// Dispatches the event.
toolItem.notifyListeners( SWT.Selection, newEvent );

return null;