Hi Yacinus,
I apologize for the delay in responding.
Below is the sample link as per your requirement.
http://websamples.syncfusion.com/samples/Grid.Web/5.1.0.51/Forum-65826/main.htmThe records enter into editable mode on double clicking it. The 'CellType' of the 'City' field is set to 'ComboBox'. The 'ComboBox' is binded to the DataSource.
Please let us know if it satisfies your requirement.
Thank you for your patience.
Regards,
Valli