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Bug 1102

Summary: ListView exception in Xamarin.Forms and Windows Phone.
Product: .NET TeeChart Reporter: narcís calvet <narcis>
Component: Xamarin.FormsAssignee: Steema Issue Manager <issuemanager>
Status: RESOLVED FIXED    
Severity: major CC: chris
Priority: Normal    
Version: TeeChart.NET 2014 4.1.2014.12154   
Target Milestone: ---   
Hardware: PC   
OS: Windows   
URL: http://www.teechart.net/support/viewtopic.php?f=4&t=15392
Chart Series: --- Delphi / C++ Builder RAD IDE Version:

Description narcís calvet 2015-01-26 05:36:52 EST 
Using the project attached at the forums URL it produces a System.NullReferenceException in Windows Phone:

System.NullReferenceException was unhandled by user code
  HResult=-2147467261
  Message=Object reference not set to an instance of an object.
  Source=TeeChart.WP8
  StackTrace:
       at Steema.TeeChart.Drawing.GestureBase.GetGesture[G,T](T instance)
       at Steema.TeeChart.Drawing.TBlockCanvas.SetCanvas[T](T canvas, Point offset)
       at Steema.TeeChart.Drawing.TBlockCanvas.SetWPSeries(Series s)
       at Steema.TeeChart.Chart.DoDraw(Graphics3D g, Int32 First, Int32 Last, Int32 Inc)
       at Steema.TeeChart.Chart.DrawAllSeries(Graphics3D g)
       at Steema.TeeChart.Chart.InternalDraw(Boolean noTools)
       at Steema.TeeChart.Chart.InternalDraw()
       at Steema.TeeChart.TChart.Draw(Rectangle rect)
       at Steema.TeeChart.TChart.MeasureOverride(Size availableSize)
       at System.Windows.FrameworkElement.MeasureOverride(IntPtr nativeTarget, Double inWidth, Double inHeight, Double& outWidth, Double& outHeight)
  InnerException: 

The problem is at GetGesture in GestureCanvases.cs at the line below where rootGrid is null.

      IEnumerable<Steema.TeeChart.IGrid> iGrids = rootGrid.Children.OfType<Steema.TeeChart.IGrid>();