How to add Telerik control in another telerik control

[Shakil]

Hello,
         I want to add a control in telerik control so please give a proper solution. 
         This is my code

         @(Html.Kendo().Window()
    .Name("window")
    .Draggable()
    .Title("Window Popup")
    .Width(600)
    .Height(200)
    .Visible(false)
    .Content(@<text>
        @Html.Label("Select Image")
        @Html.Kendo().Upload();
        </text>)

I used this code to add control but its showing error message.
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