How to SubClass ContentControl in MSWORD

[Member 10179758]

Hi, Please if some help me to find the solution or some inputs i am interested to subclass Content Control or rather i will say i am in need to create my custom control which will have same behavior as Content Control , how can i go for it i need in C++ /ATL/Com dont like to use clr c++ or any other . if some one can help me .