new System.Windows.Media.Imaging.BitmapImage( new Uri("pack://application:,,,/TeacherAssistant.Themes;component/Images/CommonBig/kejianGray2.png")),
new System.Windows.Media.Imaging.BitmapImage( new Uri("/TeacherAssistant.Themes;component/Images/CommonBig/kejianGray.png", UriKind.Relative)),
new System.Windows.Media.Imaging.BitmapImage( new Uri("pack://application:,,,/TeacherAssistant.Themes;component/Images/CommonBig/kejianGray2.png", UriKind.Absolute)),