Is anybody else concerned about the buggy demos? http://demo.sproutcore.com/sample_controls/ http://demo.sproutcore.com/sample_controls/ On "Collections" movin

Is anybody else concerned about the buggy demos? http://demo.sproutcore.com/sample_controls/ http://demo.sproutcore.com/sample_controls/ On "Collections" moving the bottom right slider doesn't resize the cells. On "Containers", dragging the blue square is pretty buggy. There are others too. That kind of stuff would be a problem for me.