[ntk] listbox command implemented as ::itcl::extendedclass ::ntk::classes::listbox

Syntax:

     :   '''ntk listbox''' ''windowPathName'' ?''options''?

Options:

    * '''-bg'''
    * '''-font'''
    * '''-fontsize'''
    * '''-textcolor'''
    * '''-bd'''
    * '''-selectioncolor'''
    * '''-selectioncallback'''
    * '''-xscrollcommand'''
    * '''-yscrollcommand'''

MethodVariables:
    * '''data'''
    * '''xoffset'''
    * '''yoffset'''
    * '''contextdata'''
    * '''sizedata'''
    * '''selected'''
    * '''peakwidth'''
    * '''peaklineheight'''
    * '''peaklinewidth'''
    * '''totalheight'''
    * '''starty'''
    * '''pendingAfterId'''

Public commands:

    * '''listboxDraw'''
    * '''insert''' ''position text''

Inheritance:

    * theme

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