Hello Nicolas,
I would suggest you to use the templateId option available in the Grid Editable tag helper:
<editable mode="popup" templateId="test"/>
The templateId should point to the ID of an HTML template element, which holds the template definition:
<script type="text/kendo-template" id="test">
<input type="text" name="propertyName"/>
</script>
Regards,
Veselin Tsvetanov
Progress Telerik
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