Changes

* Class : CMenuItem

* William Wong

* Class : CValEdit

* Richard Huynh

* Class CLineEdit

* Xing Lian

* Just preparation for the class and project

* Class : CButton

* Honghui Chen

* Class: CCheckMark

* Kamen Tarpomanov

* CDialog Destructor

* William Wong

* Done (Feb 28th, 2012) - it is in my branch, I didn't merge it to the main trunk yet

* task description