title: Sitecore set the source property of a Multilist field to allow selection of child items
body: <p>I have a template in Sitecore which contains a Multilist field which I am using to allow editors to select a number of child pages of the current page [which uses this template]. I know how to set the Source of the field to point to a particular location within the content tree (e.g. <code>sitecore/content/home/help/</code>), but cannot figure out how to set it so that it only allows selection of child items of  the current item.</p>