Indeed the mechanism of controlling pagination is using the KeepTogether
property on items that expose such functionality. Detail section has such property and from your question it is not clear what exactly is the issue you are facing. Please prepare a sample runnable report (in .trdx format preferably) that demonstrates the undesired paging and please explain what is the desired paging behavior. We will answer if such paging rule can be implemented using our product.
See also: Understanding Pagination
the Telerik team
Have you tried the new visualization options in Telerik Reporting Q1 2013? You can get them from your account.