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I can't figure out how to create a custom Grid Edit Dialog.
I was following https://ej2.syncfusion.com/blazor/documentation/grid/editing/#dialog-template but it is not even working when the Template just contains a <div>.

I'm using Syncfusion.EJ2.Blazor 17.4.42 & .Net Core 3.1

The following code will show the Grid, but when opening the dialog it will result in a emtpy dialog and an "System.NullReferenceException"

The Grid:

The Dialog:

Browser Error:

Visual Studio Error:

Thank you 
Gereon Arz