Bug 282900 [CSS] ETabFolder should support setWebbyStyle()
And have field in CSS
bundles/org.eclipse.e4.ui.workbench.renderers.swt/src/org/eclipse/e4/workbench/ui/renderers/swt/StackModelFactory.java
* 
	 * @see
	 * org.eclipse.e4.workbench.ui.renderers.swt.LazyStackFactory#internalChildAdded
	 * (org.eclipse.e4.ui.model.application.MPart,
	 * org.eclipse.e4.ui.model.application.MPart)
	 */
	@Override
	protected void internalChildAdded(MPart parentElement, MPart element) {
		
		super.internalChildAdded(parentElement, element);
		MItemPart<?> itemPart = (MItemPart<?>) element;
		CTabFolder ctf = (CTabFolder) parentElement.getWidget();
		int createFlags = 0;
		
		
		CTabItem cti = findItemForPart(parentElement, element);
		if (cti == null) {
			int index = calcIndexFor(element);
			cti = new CTabItem(ctf, createFlags, index);
		}
		cti.setData(OWNING_ME, element);
		cti.setText(itemPart.getName());
		cti.setImage(getImage(element));
		cti.setControl((Control) element.getWidget());
		
		hookTabControllerLogic(parentElement, element, cti);
	}
	private int calcIndexFor(final MPart element) {
		int index = 0;