if (!activationList.isEmpty()) {

			IEditorPart editor = findActiveEditor();

			if (editor != null) {

				return editor;

			}

		}

		MUIElement area = findSharedArea();

		if (area instanceof MPlaceholder) {

			area = ((MPlaceholder) area).getRef();

		}

		if (area != null && area.isVisible() && area.isToBeRendered()) {

			// we have a shared area, try iterating over its editors first

			List<MPart> editors = modelService.findElements(area,

					CompatibilityEditor.MODEL_ELEMENT_ID, MPart.class, null);

			for (MPart model : editors) {

				Object object = model.getObject();

				if (object instanceof CompatibilityEditor) {

					CompatibilityEditor editor = (CompatibilityEditor) object;

					// see bug 308492

					if (!editor.isBeingDisposed() && isInArea(area, model)) {

						return ((CompatibilityEditor) object).getEditor();

					}

				}

			}

		}

		MPerspective perspective = getPerspectiveStack().getSelectedElement();

		List<MPart> parts = modelService.findElements(perspective,

				CompatibilityEditor.MODEL_ELEMENT_ID, MPart.class, null);

		for (MPart part : parts) {

			Object object = part.getObject();

			if (object instanceof CompatibilityEditor) {

				CompatibilityEditor editor = (CompatibilityEditor) object;

				// see bug 308492

				if (!editor.isBeingDisposed()) {

					if (isValid(perspective, part) || isValid(window, part)) {

						return ((CompatibilityEditor) object).getEditor();

					}

				}

			}

		}

		return null;

	}

	/**

	 * Searches and returns an editor from the activation list that is being

	 * displayed in the current presentation. If an editor is in the

	 * presentation but is behind another part it will not be returned.

	 * 

	 * @return an editor that is being shown in the current presentation and was

	 *         previously activated, editors that are behind another part in a

	 *         stack will not be returned

	 */

	private IEditorPart findActiveEditor() {