contentOutlineViewer.getControl().addFocusListener(new FocusListener() {

						IContextActivation activateContext;

						@Override
						public void focusLost(FocusEvent e) {
							((IContextService) PlatformUI.getWorkbench().getService(IContextService.class)).deactivateContext(activateContext);


						}

						@Override
						public void focusGained(FocusEvent e) {
							PlatformUI.getWorkbench().getDisplay().asyncExec(new Runnable()
							{
							                public void run()
							                {
							                    activateContext = ((IContextService) PlatformUI.getWorkbench().getService(IContextService.class)).activateContext("someContext");
							                }
							            });
						}
					});