Thanks for the great tutorial. I want to use the Grouping Grid in my application. My data set is pretty large (around 7000 rows). This amount of data seems to be way too much to transmit/display all at once. I was trying to think of how I could use the model you have demonstrated with the tree-like functionality of the Grouping view. It seems like I have to split the work into at least two pieces: collecting and presenting data for the initial collapsed tree; and secondly collecting and presenting the data as each node in the tree is expanded.
Is there a better way? Can you recommend an approach? Is this even possible since the root/first level of the tree looks different from a data perspective (i.e. fewer columns than an expanded node showing record details).