Tk is great indeed. I actually started programming with it, and loved it (I don't remember encountering any glitch with it, things just worked as you say). But

Tk is great indeed. I actually started programming with it, and loved it (I don't remember encountering any glitch with it, things just worked as you say). But it has its limits. I want something more powerful (in a typed programming language capable of efficient data manipulations, rather than a text-based scripting language) and flexible (a basic API with the least constraints, not a toolkit with fixed design and implementation choices), etc.