l_subwin: Create a child widget path
Description
This function is similar to .Tk.subwin except that does
not the environment of the "tkwin" object to keep track of numbering the
subwidgets. Instead it creates a widget path (parent).looni, where i is the
smallest integer for which no widget exists yet.
Usage
l_subwin(parent, name = "w")
Value
widget path name as a string
Arguments
- parent
parent widget path
- name
child name