1. If you bind the grid with server binding, you can bind the children grid with Ajax binding.
2. if you bind the gird with Ajax binding, you can't bind the children gird with server binding, because of ClientTemplate property. This property works only client side and this stops all server logic.
For your convenience I have attached a simple test project, that shows how to bind major grid with server binding and children grid with Ajax binding.
All the best,
Hristo Germanov
the Telerik team
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