title: Kendo Grid HeaderTemplate .Sum not working as in FooterTemplate
body: <p>I want to <strong>summarize</strong> the values of the column <code>TotalPrice</code> of the Grid.</p>
  
  <p>It works fine with the Footer.Template:</p>
  
  <pre><code>.Columns(col =&gt; col.Bound(o =&gt; o.TotalPrice)
                     .FooterTemplate(@&lt;text&gt;Sum: @item.Sum&lt;/text&gt;))
  .DataSource(dataSource =&gt; dataSource
       .Server()
       ... )
  </code></pre>
  
  <p><img src="https://i.stack.imgur.com/rHe52.jpg" alt="enter image description here"></p>
  
  <p><strong>But I want:</strong></p>
  
  <p>But I want to have this row with Sum etc. <strong>above of the data rows, as first row</strong>!!
  Does anybody know how this works, either with a built-in functionality, or a stable workaround.</p>
  
  <p><strong>Try and error:</strong></p>
  
  <p>with HeaderTemplate:</p>
  
  <pre><code>.Columns(col =&gt; col.Bound(o =&gt; o.TotalPrice)
                     .HeaderTemplate(@&lt;text&gt;Sum: @item.Sum&lt;/text&gt;))
  </code></pre>
  
  <p>I get following:</p>
  
  <pre><code>Compilation Error
  Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.
  
  Compiler Error Message: CS1593: Delegate 'System.Action' does not take 1 arguments
  
  Source Error:    
  
  Line 54:           columns.Bound(o =&gt; o.TotalPrice).HeaderTemplate(@&lt;text&gt;Sum: @item.Sum&lt;/text&gt;);
  </code></pre>