The GridControl bound to a virtual source only requests top records or a specific page. You can specify which data operations are supported to prevent end users from overloading the database with non-optimal queries. The GridControl hides the UI elements for non-supported operations.
Note that virtual sources do not support text highlighting using the Search Panel. This element allows end-users to iterate between found values by pressing F3 or the built-in navigation buttons, which may lead to loading of a huge amount of rows when using virtual sources.