Bug 315907 Render menus on SWT.Show
bundles/org.eclipse.e4.ui.workbench.swt/src/org/eclipse/e4/ui/internal/workbench/swt/PartRenderingEngine.java
if (!element.isVisible()) {
					if (limbo == null)
						limbo = new Shell(Display.getCurrent(), SWT.NONE);
					parent = limbo;
				} else {
					parent = renderer.getUIContainer(element);
				}
			}
		}
		return createGui(element, parent);
	}
	/**
	 * @param element
	 */
	public void removeGui(MUIElement element) {
		MUIElement parent = element.getParent();
		AbstractPartRenderer parentRenderer = parent != null ? getRendererFor(parent)
				: null;
		if (parentRenderer != null) {
			parentRenderer.hideChild(element.getParent(), element);
		}
		AbstractPartRenderer renderer = getRendererFor(element);
		if (renderer != null) {
			renderer.disposeWidget(element);
		}
		
		if (element instanceof MContribution) {
			((MContribution) element).setObject(null);
		}