Changes

* issue 3.1.1: 3.1.1_CField (by Hiroshi Takemoto and reviewed by Peter Chen)* issue 3.1.2: 3.1.2_CDialog (by Youngjae Kim and reviewed by Wei Wang)* issue 3.1.3: 3.1.3_CLabel (by Peter Chen and reviewed by Youngjae Kim)* issue 3.2.1: 3.2.1_CLineEdit (by Fahd Wahab and Wei Wang reviewed by Hiroshi Takemoto)