Printing the chart

I have one problem by printing the chart. I use one third part library for that job. This library work normally good but in this case the chart SCI will not display any curve or axis configurations.

The code .. maybe you see something.. visual is the report (UserControl) containing the chart SCI.

public static DrawingVisual BuildGraphVisual(PageMediaSize pageSize, Visual visual)
{
var drawingVisual = new DrawingVisual();
using (var drawingContext = drawingVisual.RenderOpen())
{
var visualContent = visual;
var rect = new Rect { X = 0, Y = 0, Width = pageSize.Width.Value, Height = pageSize.Height.Value };

var stretch = Stretch.None;
var visualBrush = new VisualBrush(visualContent) { Stretch = stretch };

drawingContext.DrawRectangle(visualBrush, null, rect);
drawingContext.PushOpacityMask(Brushes.White);
}

return drawingVisual;
}