Bug 264256 [CSS] Need margins
Build ID: M1 Steps To Reproduce: This code is a problem because it expects there to be a FillLayout on the parent if(property.equals("border-width")) { ((FillLayout) parent.getLayout()).marginWidth = pixelValue; }
bundles/org.eclipse.e4.ui.workbench.renderers.swt/src/org/eclipse/e4/workbench/ui/renderers/swt/StackModelFactory.java
Widget parentWidget = getParentWidget(part);
		if (parentWidget instanceof Composite) {
			
			
			
			boolean showCloseAlways = false;
			int styleModifier = 0;
			if (part.getPolicy() != null && part.getPolicy().length() > 0) {
				String policy = part.getPolicy();
				if (policy.indexOf("ViewStack") >= 0) { 
					styleModifier = SWT.CLOSE;
				}
				if (policy.indexOf("EditorStack") >= 0) { 
					styleModifier = SWT.CLOSE;
					showCloseAlways = true;
				}
			}
			
			final CTabFolder ctf = new CTabFolder((Composite) parentWidget,
					SWT.BORDER | styleModifier);
			ctf.setUnselectedCloseVisible(showCloseAlways);
			bindWidget(part, ctf);
			ctf.setVisible(true);
			
			ctf.setTabHeight(20);
			newWidget = ctf;
			final IEclipseContext folderContext = part.getContext();
			folderContext.set(IContextConstants.DEBUG_STRING, "TabFolder"); 
			final IEclipseContext toplevelContext = getToplevelContext(part);
			final IStylingEngine engine = (IStylingEngine) folderContext