Hi Mohammad,
Just in case someone else has this problem the following http handlers must be present in the web.config in order for the control to function properly:
<system.web>
<httpHandlers>
<add verb="*" path="NevronChart.axd" type="Nevron.Chart.WebForm.NChartImageResourceHandler" validate="false"/>
<add verb="*" path="NevronScriptManager.axd" type="Nevron.UI.WebForm.Controls.NevronScriptManager" validate="false"/>
<add verb="GET,HEAD" path="NevronPrinting.axd" type="Nevron.UI.WebForm.Controls.NPrintPreviewHttpHandler" validate="false"/>
<add verb="GET,HEAD" path="NevronCustomTools.axd" type="Nevron.Examples.Chart.WebForm.NChartZoomHttpHandler" validate="false"/>
<add path="NThinChartControlHttpHandler.axd" verb="*" type="Nevron.Chart.ThinWeb.NThinChartControlHttpHandler" validate="false"/>
<add path="NAspNetThinWebControlHttpHandler.axd" verb="*" type="Nevron.ThinWeb.NAspNetThinWebControlHttpHandler" validate="false"/>
</httpHandlers>
</system.web>
.....
<system.webServer>
<validation validateIntegratedModeConfiguration="false"/>
<handlers>
<add name="NevronChart" preCondition="integratedMode" verb="*" path="NevronChart.axd" type="Nevron.Chart.WebForm.NChartImageResourceHandler"/>
<add name="NevronScriptManager" preCondition="integratedMode" verb="*" path="NevronScriptManager.axd" type="Nevron.UI.WebForm.Controls.NevronScriptManager"/>
<add name="NThinChartControlHttpHandler" preCondition="integratedMode" verb="*" path="NThinChartControlHttpHandler.axd" type="Nevron.Chart.ThinWeb.NThinChartControlHttpHandler"/>
<add name="NAspNetThinWebControlHttpHandler" preCondition="integratedMode" verb="*" path="NAspNetThinWebControlHttpHandler.axd" type="Nevron.ThinWeb.NAspNetThinWebControlHttpHandler"/>
<add name ="NPrintPreviewHttpHandler" preCondition="integratedMode" verb="GET, HEAD" path="NevronPrinting.axd" type="Nevron.UI.WebForm.Controls.NPrintPreviewHttpHandler"/>
<add name ="NevronCustomTools" preCondition="integratedMode" verb="GET, HEAD" path="NevronCustomTools.axd" type="Nevron.Examples.Chart.WebForm.NChartZoomHttpHandler"/>
</handlers>
</system.webServer>