Fair point, both you and malkia. I'm C99/C11 guy though, but always resort to Qt for frontends. I wish we had more (any) C only solutions out there. Yeah, I know..Glib...sigh.
We "were" in the same boat: our company decided to build UIs using C# and leaving the hardcore modules to C/C++, interfacing them via COM. Developing UI interfaces in C++ under Windows is a pain in the ass.
An example of this is our SpyStudio product[1], which was developed in C# using our Deviare technology[2] for instrumenting binary applications.
We had a legacy application using MFC/C++ and no one anymore likes MFC at the studio, so we had to either somehow switch to C#/Windows.Forms|WPF overnight or slowly move to something else. Since there is MfcMigration toolkit for Qt - slow progress was the choice - so every week less and less of MFC is visible, and more and more from Qt.
Other toolkits can benefit if there is a transition layer - or at least something where you can plug into the existing message pipeline, windowing system - and then start replacing widget by widget, dialog by dialog.
