How to use cvinvoke.grabcut with mask in C# emgu 3.0

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C#

Emgu-CV

Hi,
I am creating a interactive Grabcut algorithm which is taken from the Open CV. Iam doing this in c# Emgu 3.0. I was able to draw a rectangle to extract the foreground image using
the below code.

using (Matrix<double> bgdModel = new Matrix<double>(1, 13 * 5))
         using (Matrix<double> fgdModel = new Matrix<double>(1, 13 * 5))
         {
             CvInvoke.GrabCut(original, mask1, new Rectangle(0, 0, original.Width, original.Height), bgdModel, fgdModel, 1, Emgu.CV.CvEnum.GrabcutInitType.InitWithRect);
             CvInvoke.GrabCut(original, mask1, rect, bgdModel, fgdModel, 2, Emgu.CV.CvEnum.GrabcutInitType.Eval);
         }

Now the next part is that, I want to create a Interactive touch but I cannot find any references to use the Grabcut method with mask in c#. Can any one please help me out.

Thanks,
Indra

What I have tried:

I was able to succeed in drawing the mask area and then passing the mask into below section but it is not working.

using (Matrix<double> bgdModel = new Matrix<double>(1, 13 * 5))
         using (Matrix<double> fgdModel = new Matrix<double>(1, 13 * 5))
         {
             CvInvoke.GrabCut(original, mask1, new Rectangle(0, 0, original.Width, original.Height), bgdModel, fgdModel, 1, Emgu.CV.CvEnum.GrabcutInitType.InitWithRectMask);
             CvInvoke.GrabCut(original, mask1, rect, bgdModel, fgdModel, 2, Emgu.CV.CvEnum.GrabcutInitType.Eval);
         }<pre lang="c#">

I am unable to understand How to pass the selected area in this method.