You can download imgui your self and look at the demo included in the source code. Most of the features are available through the DLL. I am working at the moment on missing features. I will recreate the imgui demo in Lite-C, so I don't miss a feature, but that will take some time, because this is only a hobby.
And sorry for the different notation of the methods but I dispise Camelcase notation very much and used undescore notation for the imgui methods.