Once the dataset is changed, the grid's data layer is informed and takes care for the update. There might be some specific details related to your case which prevent the data layer from being updated with the changes changes.
Can you, please, provide us with a simple test project that exposes the problem you are experiencing so that we can analyze it further and provide you with solution. Thank you, and please let us know if there is anything else we can help with.
the Telerik team