Bug 50340 [Contributions] Large toolbar buttons under Windows XP
200401201132 - enable SWT to use Windows XP widgets (provide java.exe.manifest file; for details see SWT mailing list) - observe: the toolbar buttons are really large !! See attached screen shot
bundles/org.eclipse.jface/src/org/eclipse/jface/action/ActionContributionItem.java
this.mode = mode;
		update();
	}
	
	/**
	 * The action item implementation of this <code>IContributionItem</code>
	 * method calls <code>update(null)</code>.
	 */
	public final void update() {
		update(null);
	}
	/**
	 * Synchronizes the UI with the given property.
	 *
	 * @param propertyName the name of the property, or <code>null</code> meaning all applicable
	 *   properties 
	 */
	public void update(String propertyName) {
		if (widget != null) {
						
			boolean textChanged = propertyName == null || propertyName.equals(IAction.TEXT);
			boolean imageChanged = propertyName == null || propertyName.equals(IAction.IMAGE);
			boolean tooltipTextChanged =
				propertyName == null || propertyName.equals(IAction.TOOL_TIP_TEXT);
			boolean enableStateChanged =
				propertyName == null
					|| propertyName.equals(IAction.ENABLED)
					|| propertyName.equals(IContributionManagerOverrides.P_ENABLED);
			boolean checkChanged =
				(action.getStyle() == IAction.AS_CHECK_BOX