I have a Master Page setup divided into three sections: a Menu Bar (not a control, just a <div> with links), a Search/Features ContentPlaceHolder and a Main ContentPlaceHolder.

Depending on what link the user clicks in the Menu Bar, I populate different controls into each ContentPlaceHolder.  One of the 'views' has a TreeView control in the Search/Features area which when having a node clicked, displays a specific view or page in the Main area.  The root nodes are essentially grouping descriptions that need to have a configuration page associated with them -- the layout is the same for each configuration, just the content in the page is slightly different.  Then, the child nodes will have a different layout from said configuration page, but will be the same for all child nodes regardless of grouping description.  So, I have two general page layouts that I would like to dynamically populate when clicked.  The problem is I can't get them to display in the other <Content> area. 

I've tried setting up the NavigateURL to the .aspx layout page and the target to the name of the ContentPlaceHolder.  It doesn't work, naturally, and I would think that this makes sense.  So, how can I change the contents of one <Content> page from another?  Do I need to go searching through the Master Page's controls?

I have the feeling I chose a misleading Subject.  Basically, I want to dynamically load a page in one <Content> from another <Content>.  A sitemap won't necessarily suffice here as it's not feasible for me to create 100s or 1000s of different pages for each item.

I think this is possible, but I am not sure how I get <Content>-to-<Content> access, if that's really what I am doing anyways.  (I think it is.)

To continue this trend of talking to myself..

If I set the NavigateURL and Target properties of my root nodes (the group description and configuration nodes).  The MainContent portion displays said page, but it opens a new window.  So, at this point, I want to eliminate that effect as well as be able to populate the MainContent portion with data based on the Node clicked (ie. if SelectedNode.Value == "this category", then here is what the page displays).

I believe this gets me back to accessing one <Content> from another <Content>, or more specifically, accessing the controls.

This is possible, yes?

To continue this trend of talking to myself..

If I set the NavigateURL and Target properties of my root nodes (the group description and configuration nodes).  The MainContent portion displays said page, but it opens a new window.  So, at this point, I want to eliminate that effect as well as be able to populate the MainContent portion with data based on the Node clicked (ie. if SelectedNode.Value == "this category", then here is what the page displays).

I believe this gets me back to accessing one <Content> page from another <Content>page, or more specifically, accessing the controls.

This is possible, yes?