I guess what you are seeking for is right GUI implementation toolkit.
Currently you are going on with default provided with devC++, that is MFC and ATL oriented(Sorry if i am not right here but i thought so) .... So your best guide is microsoft's MSDN library. We hope tat You will find good documentation for window's GUI toolkits.
What you can go for is either Qt or Juce or WxWidget kind of easy to develop GUI toolkits with C++, and it is also easy to configure all of them in DevC++ (To use these libraries)