Provides the way of window creation the properties of this window are appended --in case of '-class' directly-- afterward.
Example 3.48. ::vgcode::dump-widget using instantiate
...
set classname \
[substitutep $classname]
debug stdout "Now the item is created from : $classname as $ta_name"
append output \
[dumper::instantiate $classname $ta_name "converted from \
[winfo class $target]"]