Steps to reproduce:

1. Insert a simple TelerikGrid on your page
2. Add Columns with templates for each property
3. Specify a Column Template

See https://blazorrepl.telerik.com/GyPvFMFr00zLEEdG00

Problem / Inconvenience

• Context has to be converted/cast before access to the each property is possible
• Grid columns are not generic which makes them hard to use sometimes
• Fields have to be specified by name (may lead to wrong names after changing)

Solution / Feature Request

• Provide new generic columns (to ensure no current implementations break)
  
• Add [CascadingTypeParameter(nameof(TItem))] to the TelerikGrid
• GridColumns automatically "inherit" the typeparam TItem
  

Idea from: Blazor QuickGrid

Benefits

• GridColumns can be specified with Expression
• Template context does not have to be cast anymore
• Renaming properties affect expression or an error is display (property does not exist)

<GridColumn For="@(t => t.Name)">
        <Template>
                <div>
                    @item.Name
                </div>
        </Template>
</GridColumn>