Please how can I make a simple hand gesture application for Kinect

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WPF

C#3.5

Kinect

The examples I have show the old beta codes, can someone help here please. I don't understand the codes here

private void ProcessGesture(Joint head, Joint handleft, Joint handright)
        {
           /* Microsoft.Research.Kinect.Nui.Vector vector = new Microsoft.Research.Kinect.Nui.Vector();
            vector.X = ScaleVector(800, handright.Position.X);
            vector.Y = ScaleVector(600, -handright.Position.Y);
            vector.Z = handright.Position.Z;

            handright.Position = vector;**/
}

and this one too

private void SetEllipsePosition(Ellipse ellipse, Joint joint)
        {
            /*Microsoft.Research.Kinect.Nui.Vector vector = new Microsoft.Research.Kinect.Nui.Vector();

            vector.X = ScaleVector(800, joint.Position.X);
            vector.Y = ScaleVector(600, -joint.Position.Y);
            vector.Z = joint.Position.Z;

            Joint updatedJoint = new Joint();
            updatedJoint.ID = joint.ID;
            updatedJoint.TrackingState = JointTrackingState.Tracked;
            updatedJoint.Position = vector;

            Canvas.SetLeft(ellipse, updatedJoint.Position.X);
            Canvas.SetTop(ellipse, updatedJoint.Position.Y);
            */

        }