Article relates to
RadComboBox v2.x+, RadGrid v.3.x+
RadControls AJAX (Prometheus)
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You can configure the template combobox instance as a custom editor for the grid column by:
Finally, on update command you can reference the ContainerControl of your custom editor instance (which is the table cell holding the combobox editor) to extract the value selected by the user. Then you can update the grid data source with the new entries and refresh the control to reflect the changes.
Note: Grid's AJAX mode is switched on to optimize performance.
You can find a working project in the attached zip project (620_Combo_In_Grid_Autocomplete.zip)