Bug 306251 MContext's properties needs to actually be populated into the context
Need to fix CPR and then add the code in PRE.
bundles/org.eclipse.e4.ui.workbench.swt/src/org/eclipse/e4/ui/workbench/swt/internal/PartRenderingEngine.java
Control ctrl = (Control) removed.getWidget();
					ctrl.setLayoutData(null);
					ctrl.getParent().layout(new Control[] { ctrl },
							SWT.CHANGED | SWT.DEFER);
				}
				if (renderer != null)
					renderer.hideChild(changedElement, removed);
			}
		}
	};
	private IEclipseContext appContext;
	protected Shell testShell;
	protected MApplication theApp;
	public PartRenderingEngine() {
	}
	public PartRenderingEngine(String curFactoryId) {
		this.curFactoryId = curFactoryId;
	}
	/**
	 * Initialize a part renderer from the extension point.
	 * 
	 * @param registry
	 *            the registry for the EP
	 * @param r
	 *            the created renderer
	 * @param context
	 *            the context for the part factories
	 * @param f
	 *            the IContributionFactory already provided to <code>r</code>
	 */