Could you please elaborate a bit more on your scenario? Are you changing the MasterTableView page number or DetailTables page number?
If you want to retain the expanded/collapsed state when you change page number of the parent table, please check out the following code library example:
Also I am sending you a simple example which contains the hierarchical RadGrid with enabled paging on the DetailTables. Please check it out and let me know what differs in your case.
All the best,
Radoslav
the Telerik team
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