* @return a new part stack container
*/
private PartStack createStack(EditorSashContainer editorSashContainer) {
WorkbenchPage workbenchPage = (WorkbenchPage) PlatformUI.getWorkbench().getActiveWorkbenchWindow()
.getActivePage();
EditorStack newWorkbook = EditorStack.newEditorWorkbook(editorSashContainer, workbenchPage);
return newWorkbook;
}