Greetings from Syncfusion support.
We have validated and prepared a sample for your requirement “Template Dialog for DataGrid” at our end .We achieved your requirement using dialogTemplate property and here we import DialogTemplate form another vue(dialog-temp) file.
By default, When you double click the DataGrid row in DialogTemplate, dialog popup is opened automatically. Please refer to the below sample and documentation links.
Please get back to us, if you need any further assistance.
Seeni Sakthi Kumar S