The Big Gtk limitations: a reliable GUI builder

[Pozz Pozz <pozzugno gmail com>]

I don't know why, but some weeks ago I selected Gtk as my next GUI
framework to learn. After some work, I have a very big issue: the
associated GUI builder Glade is not stable at all.

Many times, when I work with Treeview and Liststore, Glade crashes. I can't
press Ctrl+C to copy a sub-tree to another place.
The render is not good: margins aren't shown correctly after loading the
file.
It's impossible to move widgets from one place to another (maybe from one
box element to a grid element).

I know I can design the GUI directly in the code, but it's a big effort for
me. Usually my GUIs are full of widgets and I'd like to preview them.

How do you create complex GUIs? Do you really use pen and paper and write
it directly in code?

IMHO this is a very big limitation and I'm tempted to migrate to QT
libraries, even if I loose many working days.