Hi,
i am getting below exception,
i am using SurfaceChartLegendRenderer for legend ,


System.InvalidOperationException was unhandled
Message=Handle is not initialized.
Source=mscorlib
StackTrace:
at System.Runtime.InteropServices.GCHandle.Free()
at Nevron.GraphicsGL.lI1lIIII1.l1l1II11Il()
at Nevron.GraphicsGL.l1111I11l.Deactivate()
at Nevron.GraphicsGL.GLBitmapRenderSurface.Deactivate()
at Nevron.GraphicsGL.lI1lIIII1.lI1l111I(Boolean lIlI1lI1)
at Nevron.GraphicsGL.lI1lIIII1.ClearDeviceSpecificResources()
at Nevron.GraphicsGL.lI1lIIII1.Dispose()
at Nevron.Chart.NChartRenderingContext3D.Dispose(Boolean disposing)
at Nevron.Chart.NChartRenderingContext.Finalize()
InnerException:


Please help in resolve this problem...

while running the code sometimes its shows this error.