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
* Compares this action contribution item with another object.
	 * Two action contribution items are equal if they refer to the identical Action.
	 */
	public boolean equals(Object o) {
		if (!(o instanceof ActionContributionItem)) {
			return false;
		}
		return action.equals(((ActionContributionItem) o).action);
	}
	/**
	 * The <code>ActionContributionItem</code> implementation of this
	 * <code>IContributionItem</code> method creates an SWT <code>Button</code> for
	 * the action using the action's style. If the action's checked property has
	 * been set, the button is created and primed to the value of the checked
	 * property.
	 */
	public void fill(Composite parent) {
		if (widget == null && parent != null) {
			int flags = SWT.PUSH;
			if (action != null) {
				if (action.getStyle() == IAction.AS_CHECK_BOX)
					flags = SWT.TOGGLE;
				if (action.getStyle() == IAction.AS_RADIO_BUTTON)
					flags = SWT.RADIO;
			}
			Button b = new Button(parent, flags);
			b.setData(this);
			b.addListener(SWT.Dispose, getButtonListener());
			
			b.addListener(SWT.Selection, getButtonListener());