switchable between Tk (standard Tcl/Tk widget set) and 
  Ttk (Tile). Initial default widget set is Tk. Now, toplevel 
  widget classes are removed and defined as aliases. 
  For example, "TkButton" is an alias of the "Tk::Button" class. 
  Those aliases are replaced when switching default widget set. 
  "Tk.default_widget_set=" is the method for switching default 
  widget set. "Tk.default_widget_set = :Ttk" defines Ttk (Tile) 
  widget set as default. It means that "TkButton" denotes 
  "Tk::Tile::Button" class. And then, "TkButton.new" creates 
  a Tk::Tile::Button widget. Of course, you can back to use 
  standard Tk widgets as the default widget set by calling 
  "Tk.default_widget_set = :Tk", whenever you want. Based on 
  thie feature, you can use Ttk widget styling engine on your 
  old Ruby/Tk application without modifying its source, if you 
  don'tuse widget options unsupported on Ttk widgets (At first, 
  call "Tk.default_widget_set = :Ttk", and next load and run 
  your application). 
  This is one step for supporting Tcl/Tk8.5 features.


git-svn-id: http://svn.ruby-lang.org/repos/ruby/trunk@15618 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

  make them private [ruby-dev:30074].
* ext/tk/lib/tk/txtwin_abst.rb: fix typo [ruby-dev:30073].
* ext/tk/lib/tk/canvas.rb (TkCanvas#scan_dragto): lack of an argument.
* ext/tk/lib/tk/canvas.rb: clarify the  including module name [ruby-dev:30080].
* ext/tk/lib/tk/scrollable.rb: change primary name of modules [ruby-dev:30080].
* ext/tk/lib/tkextlib/iwidgets/checkbox.rb: wrong number of arguments 
  [ruby-Bugs-7776].
* ext/tk/lib/tkextlib/iwidgets/radiobox.rb: ditto.
* ext/tk/lib/tkextlib/blt/tile/checkbutton.rb: change primary name of
  class [ruby-dev:30080].
* ext/tk/lib/tkextlib/blt/tile/radiobutton.rb: ditto.
* ext/tk/ChangeLog.tkextlib: update.
* ext/tk/lib/tkextlib/version.rb: update.


git-svn-id: http://svn.ruby-lang.org/repos/ruby/trunk@11577 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

* ext/tk/lib/tkextlib/blt/*.rb: ditto
* ext/tk/lib/tkextlib/blt/tile/*.rb: ditto


git-svn-id: http://svn.ruby-lang.org/repos/ruby/trunk@7645 b2dd03c8-39d4-4d8f-98ff-823fe69b080e