WPF Dashboard best practices?

I am building a dashboard where a user can add panels and also resize and move the individually. Then end result might look something like this:

Basically I want it to be like Blacklight's "drag drop panel" but with resizable panels.

What is the best practice to use if I don't want to use a dock manag开发者_如何转开发er control? I thought about using a collection of user controls made of stackpanels, or some sort of grid, but I am afraid I'm over-thinking it.