interactive dialog creation with opengl [closed]

Answer 1

You can force this by just drawing all the buttons and implement a kind of text field, but this is not what OpenGL is made for.
At your place I would use a language like Objective-C for Mac platforms, and C# for Windows platforms.If instead you want to stick with C++, then use a library like Qt.

Answer 2

OpenGL is not the library you are looking for, there are many thing you can do with it but this is not one of that, for the graphic user interface you can use GLUI http://en.wikipedia.org/wiki/OpenGL_User_Interface_Library

for some more articulated you can use AntTweakBar http://www.antisphere.com/Wiki/tools:anttweakbar

Both are well integrated with OpenGL