cascade classifier data structure

Hello all! For my own implementation of Viola-Jones algorithm partly I use some methods and structures of OpenCV. For example, reading of images to structure CvMat. Now I need to use cascade classifier. For example, I decide to use class cv::CascadeClassifier. Is there easy way to access members of this class? For example to vector. This member somehow is protected... Or exists another similar structure? Thanks for the answers.