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Hi adamhughes,
My colleague has already provided an answer to the same question of yours in this forum post:
Editing in a Grid in Hierarchy view
Is the answer provided not clear? Are you looking for something different?
As for expanding and collapsing all rows I suggest reviewing the knowledgebase article dedicated on the matter:
Expand and Collapse All Detail Rows in Grid
I hope this helps.
Regards, Aleksandar Progress Telerik
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