This doesn't work: apt.Description = DescriptionText.Text;

Scheduler component has feature "Export to PDF". When PDF is generated, there is image inside. But quality of this image is really poor.

Based on source code, there is method in SchedulerExporter.cs
 ​        private void ConvertBitmapToJpeg(Bitmap bmp)
         {
             var ms = new MemoryStream();
             bmp.Save(ms, ImageFormat.Jpeg);
             _gifArray.Add(ms.ToArray());
         }

But there is no encoder settings parameter used (http://msdn.microsoft.com/en-us/library/system.drawing.bitmap.save(v=vs.110).aspx). Please add a possibility to control output image quality.

Thus, appointment resizing is not possible in RadScheduler with RenderMode="Mobile" if a time slot is tapped before tapping the appointment.
Note: If the RadScheduler is scrolled between the time slot tap and the appointment tap, then resizing is possible again.