Using a checkbox in a datagrid

I added a checkbox to the template of a column in my data grid. The checkbox is databound to a boolean field in the grid datasource. I am trying to play with the Change event of the checkbox: my handler is just trying to show a basic "Hello" notification when the checkbox changes.... This generates a compile error...

dotnet: obj\Debug\netcoreapp3.1\Razor\Pages\AnswerQuestion.razor.g.cs(160,275): error CS1503: Argument 2: cannot convert from 'Microsoft.AspNetCore.Components.EventCallback' to 'Microsoft.AspNetCore.Components.EventCallback' [C:\Users\User\Documents\GitHub\LLAPP\Radzen\server\LenoxLaser.csproj]
obj\Debug\netcoreapp3.1\Razor\Pages\AnswerQuestion.razor.g.cs(142,177): error CS1662: Cannot convert lambda expression to intended delegate type because some of the return types in the block are not implicitly convertible to the delegate return type

What am I doing wrong? Thanks!

You can set TValue attribute to bool to resolve this:

That was it, thanks!