Bug 267242 [JFace] Add API to configure table and tree columns in a keyboard-accessible way
bundles/org.eclipse.ui.views/src/org/eclipse/ui/views/properties/PropertySheetPage.java
}
            };
        }
        return cellEditorActivationListener;
    }
    /* (non-Javadoc)
     * Method declared on IPage (and Page).
     */
    public Control getControl() {
        if (viewer == null) {
			return null;
		}
        return viewer.getControl();
    }
    /**
     * Handles a selection change in the entry table.
     *
     * @param selection the new selection
     */
    public void handleEntrySelection(ISelection selection) {
        if (defaultsAction != null) {
            if (selection.isEmpty()) {
                defaultsAction.setEnabled(false);
                return;
            }
            
            boolean editable = viewer.getActiveCellEditor() != null;
            defaultsAction.setEnabled(editable);
        }
    }