I made a sample program using KinectBodyList object in Small Basic programming language.
The program has been uploaded as TCG608. NUI stands for Natural User Interface. You can drag and drop the circle (ellipse) in this program with your right hand. KinectBodyList.GetHandState operation can return that your hand is "Closed", "Lasso" or "Open". When your right hand is "Closed" on the circle, you can grab the circle.