Hello,

another cry for help i can withdraw.

Yes, it was line 380 in

" 378 PyObject *Button_new(PyTypeObject *type, PyObject *args, PyObject *kwds) {
379 Button *self;
380 self = (Button *)Pikt_new(&Button_Type, args, kwds);
381 self->Q.gobj = PyCapsule_New(newfunc, "Button", NULL);
382 if (! self->Q.gobj) { Py_DECREF(self); KTERR("Cannot create Button");};
383 return (PyObject *)self;
"

(newfunc came - as the backslashes - from the original preprocessor macro (the second argument), where i had filled Button in for the first argument). With the normal

self = (Button *)type->tp_alloc(type, 0)

things work now. Still not all is fine, but now these widgets can be subclassed. Unfortunately i cannot remember exactly, what lines in what part of the tutorial or references (or a comment in the sources ?) brought me to the idea to need the wrong code as above.

Thanks for reading, Joost