>I am familiar with frames, but need an alternative. The separate, resizable container cells that I have are closely coupled, so maintaining state and sharing objects between them is more cumbersome than it would be if they were all in a single page that could contain all my code behind.
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>I want a container control that allows me to define resizable sub-panes. You can manipulate window contents with scrollbars without hitting the server. I would not want to have to repost to resize the containers. I'm not sure that browsers could even support such functionality.
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>Anyone know of such a component or have suggestions for writing one?

I am using a table so that the height automatically grows if the content changes. In other places where I do not want the screen real esatate to change I use a fixed height DIV with Style Builder Layout -> Overflow: use scroll bars if needed.