Creating screenshots of scichart surface

Hello again. We have an application that has many tabs with scichart surface. Our goal is creating a report: screenshots of all scichart surfaces in tabs. But we found out, when scichartsurface was not active, all tick labels didn’t render on screenshots.
Here is our code snippet for creating screenshot:

double actualHeight = source.RenderSize.Height;
            double actualWidth = source.RenderSize.Width;
            double renderHeight = actualHeight * scale;
            double renderWidth = actualWidth * scale;

            RenderTargetBitmap renderTarget = new RenderTargetBitmap((int)renderWidth, (int)renderHeight, 96, 96, PixelFormats.Pbgra32);
            VisualBrush sourceBrush = new VisualBrush(source);
            DrawingVisual drawingVisual = new DrawingVisual();

            using (var drawingContext = drawingVisual.RenderOpen())
            {
                drawingContext.PushTransform(new ScaleTransform(scale, scale));
                drawingContext.DrawRectangle(sourceBrush, null, new Rect(new Point(0, 0), new Point(actualWidth, actualHeight)));
            }
            renderTarget.Render(drawingVisual);
            JpegBitmapEncoder jpgEncoder = new JpegBitmapEncoder();
            jpgEncoder.QualityLevel = quality;
            jpgEncoder.Frames.Add(BitmapFrame.Create(renderTarget));

            Byte[] _imageArray;
            using (MemoryStream outputStream = new MemoryStream())
            {
                jpgEncoder.Save(outputStream);
                _imageArray = outputStream.ToArray();
            }
            return _imageArray;

How can we fix it?

Thanks in advance