The error that you might see is the that inside EditorTemplates/String.cshtml you will have to change the model from string to object
@Html.TextBoxFor(model => model,
Once the project runs again, you will see that in the popup the MultiSelect editor is not applied, this is because Html.EditorForModel
method that the Grid uses internally does not generate editors for the nested complex properties.
To make it work you will have the customize the whole popup editor like described here
, and re-use the MultiSelect configuration from the TerritoriesEditor.cshtml
If you faced an issue during the implementation share your project here so I can advise you further.
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