Set theme for dynamically created controls

Hello,
     I encountered a problem: I wanted to dynamically create a CXTPEdit control on a CFormView and set its theme to xtpControlThemeVisualStudio2015. So, I referenced the demo Controls.exe, but the CXTPEdit in Controls.exe was drawn through a dialog box, not dynamically created. Therefore, I dynamically created a CXTPEdit in Controls.exe, but the result was the same as in CFormView: the dynamically created CXTPEdit did not have the xtpControlThemeVisualStudio2015 theme, meaning that when the mouse moved over the Edit, no bright border was displayed, and when the mouse moved away from the Edit, the border disappeared. My Create code and the final effect are shown below. Please help me identify any issues with my code? Thank you