You can use the PageFactory extension to do that: http://ext.radiantcms.org/extensions/221-page-factory
This will let you specify both the default set of parts for specific types of pages (Body, Extended, Sidebar, &c) as well as the default content for each of those. There's a walkthrough in the git repo (https://github.com/joshfrench/radiant-page_factory-extension/blob/master/EXAMPLES.md) and a screencast (http://radiantcms.org/blog/archives/2010/05/03/radiantcasts-episode-11-radiant-page-parts-and-page-factory-extensions/) to get you started. I'm also close to releasing version 2.0, which gets rid of the PageFactory::Base class and lets you work directly with Page subclasses. But it doesn't add any new features so there's no reason not to use the existing release. Let me know if you have any questions. j On Nov 23, 2010, at 5:53 AM, Hadi S. wrote: > Hi, > > i am new to Radiant and trying to find out how to set the default > content for the body and page parts tabs. Is there a way or any > extensions available to do that in Radiant? > On the admin backend under Settings/Application there is the > possibility to set the deafult page parts. But i can't see any way of > setting the default content of this parts.