custom widget, gtkmm with glade support and custom properties?

Hello,

I have a question about creating custom widgets using gtkmm with glade
support and additional properties hooked into them, 

I tried without success to find the clues I need in the documentations but
do not get the picture how to use it in the right context. 

As of now I succeeded to create a custom derived widget and minimal support
code creating a .so lib and a glade catalog with properties I need and it's
all loading and showing fine in glade. Can set/change properties but it's
missing the "do_child_set/get..." methods (get a warning) like this: 

(glade:3214):  GLib-GObject-WARNING **: g_object_set_property: object class
`gtkmm__CustomObject_customwidget' has no property named `frobnicated-size' 


I need to know how the prototypes or definitions have to be defined in C++. 

However, I am lost with the next step to access/support the properties
within my derived widget in C++. using gtkmm. See below what I have so far. 

See here for my testing code (I tried unsuccessfully to add the code of
interest here): 
https://sourceforge.net/p/gxsm/gxsm3/ci/71f858cad5fa74656f69c985fa16d8b3938be859/tree/app/

I appreciate any hints or a basic example how to get going from here. 
thanks 
-Percy 
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