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diff --git a/ruby_1_8_6/ext/tk/sample/tktree.rb b/ruby_1_8_6/ext/tk/sample/tktree.rb
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+++ b/ruby_1_8_6/ext/tk/sample/tktree.rb
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+##########################################################################
+# TkTree widget class
+#
+#    see <http://wiki.tcl.tk/10615>
+#
+#  Note:  optional argument '-font' of the Tcl library is changed to 
+#         'itemfont' on this Ruby library, because of avoiding font 
+#         operation trouble in 'initialize' method  ( see the following 
+#         test script ). 
+#
+##########################################################################
+require 'tk'
+
+class TkTree < TkCanvas
+  TCL_SCRIPT_PATH = File.join(File.dirname(__FILE__), 'tktree.tcl')
+
+  def create_self(keys)
+    args = [@path]
+    if keys.kind_of?(Hash)
+      font = keys.delete('itemfont')
+#      font = hash_kv(font) if font.kind_of?(Hash)
+      keys['font'] = font if font
+#      args.concat(hash_kv(keys))
+      args << keys
+    end
+    begin
+      tk_call('::tktree::treecreate', *args)
+    rescue NameError, RuntimeError
+      Tk.load_tclscript(TkTree::TCL_SCRIPT_PATH)
+      tk_call('::tktree::treecreate', *args)
+    end
+  end
+
+  def newitem(itempath, keys = nil)
+    if keys.kind_of?(Hash)
+      keys = _symbolkey2str(keys)
+      font = keys.delete('itemfont')
+#      font = hash_kv(font) if font.kind_of?(Hash)
+      keys['font'] = font if font
+#      tk_call('::tktree::newitem', @path, itempath, *hash_kv(keys))
+      tk_call('::tktree::newitem', @path, itempath, keys)
+    else
+      tk_call('::tktree::newitem', @path, itempath)
+    end
+  end
+
+  def delitem(itempath)
+    tk_call('::tktree::delitem', @path, itempath)
+  end
+
+  def labelat(xpos, ypos)
+    tk_call('::tktree::delitem', @path, xpos, ypos)
+  end
+
+  def getselection
+    tk_call('::tktree::getselection', @path)
+  end
+
+  def setselection(itempath)
+    tk_call('::tktree::getselection', @path, itempath)
+  end
+end
+
+
+##########################################################################
+# test script
+##########################################################################
+if __FILE__ == $0
+  TkLabel.new(:text=><<EOL, :relief=>:ridge, :justify=>:left).pack
+
+ This is a sample to use a Tcl library script on Ruby/Tk. 
+ This sample loads tktree.tcl (see <http://wiki.tcl.tk/10615>) 
+ and calls functions of the Tcl script. 
+EOL
+
+  items = %w(/group1/item1 /group1/item2 /group1/subgroup/item1 /group2/item1 /item1)
+
+  tr1 = TkTree.new.pack(:expand=>true, :fill=>:both)
+  tr1.focus
+
+  items.each{|item|
+    tr1.newitem(item, 
+                :command=>proc{Tk.messageBox(:message=>"#{item} executed")})
+  }
+
+  f = TkFrame.new.pack(:expand=>true, :fill=>:both)
+  tr2 = TkTree.new(f, :bg=>'black', #:itemfont=>{:family=>'Times', :size=>14}, 
+                   :textcolor=>'red', :bd=>4, :relief=>:ridge, 
+                   :selectbackground=>'darkBlue', :selectforeground=>'yellow', 
+                   :selectborderwidth=>3, :linecolor=>'yellow') {
+    yscrollbar(TkScrollbar.new(f, :width=>10).pack(:side=>:right, :fill=>:y))
+    xscrollbar(TkScrollbar.new(f, :width=>10).pack(:side=>:bottom, :fill=>:x))
+    pack(:expand=>true, :fill=>:both)
+  }
+
+  items.each{|item|
+    tr2.newitem(item, :textcolor=>'green', :image=>'', 
+                :itemfont=>{:family=>'Times', :size=>10}, 
+                :command=>proc{Tk.messageBox(:message=>"#{item} executed")})
+  }
+
+  Tk.mainloop
+end