Nested module: use layout of parent module

I’ve got a nested module, and I’d like to use the layout of the parent module. How can I do that? Neither of the following options work:


	public $layout = '//layouts/column1'; // The application layout is used

	public $layout = '/layouts/column1'; // The current module layout is used




The doc says that you can use the parent module’s layout by setting “layout” to null.

http://www.yiiframework.com/doc/api/1.1/CWebModule#layout-detail

Or, you may want to specify “layoutPath” to point to the parent module’s layout path.

http://www.yiiframework.com/doc/api/1.1/CWebModule#layoutPath-detail