Am getting the error 'nChartControl1' does not exist in the current content

I normally add the line protected System.Web.UI.WebControls following by the field type, how can I do this from Nevron?

Thanks, have add the extra references, but still cant access the chart control.

ASPX page
<table id="Table1" style="width: 745px; vertical-align: top;" summary="Example layout table">
<tr>
  <td id="Td1" class="ImageCell" style="width: 420px; vertical-align: top;">
   <!-- Chart control placeholder BEGIN -->
   <ncwc:NChartControl id="nChartControl1" runat="server" Width="420px" Height="320px">
   </ncwc:NChartControl>
   <!-- Chart control placeholder END -->
  </td>
  <td id="exampleVDelimiterCell" class="DelimiterCell" rowspan="2"> </td>
  <td id="exampleConfigurationCell" class="ControlsPanel" rowspan="2" style="width: 325px;">
  </td>
</tr>
</table>

c# Page cant see the control nChartControl1

Hi Mike,

Please make sure to include:
<%@ Register TagPrefix="ncwc" Namespace="Nevron.Chart.WebForm" Assembly="Nevron.Chart.WebForm" %>

at the top of the aspx page. Let us know if the problem persists.

Best Regards,
Nevron Support Team