diff --git a/ChangeLog b/ChangeLog
index 1a4a7dcd9c..8ab5b7d456 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+Fri Apr 18 07:56:18 2008  Hidetoshi NAGAI  <nagai@ai.kyutech.ac.jp>
+
+	* ext/tk/lib/tk.rb, ext/tk/lib/tk/scrollbar.rb, ext/tk/lib/tk/scale.rb:
+	  improve unknonw-option check when create a widget. 
+
+	* ext/tk/lib/tkextlib/blt/unix_dnd.rb, ext/tk/lib/tkextlib/blt/ted.rb,
+	  ext/tk/lib/tkextlib/treectrl/tktreectrl.rb: bug fix on 'cget'.
+
 Thu Apr 17 22:03:52 2008  akira yamada  <akira@arika.org>
 
 	* lib/uri/ftp.rb, lib/uri/generic.rb, test/uri/test_common.rb,
diff --git a/ext/tk/lib/tk.rb b/ext/tk/lib/tk.rb
index a5cb8cb67d..2aafcfecc3 100644
--- a/ext/tk/lib/tk.rb
+++ b/ext/tk/lib/tk.rb
@@ -4799,8 +4799,15 @@ class TkWindow<TkObject
           tk_call_without_enc(cmd, @path)
           keys = __check_available_configure_options(keys)
           unless keys.empty?
-            tk_call_without_enc('destroy', @path)
-            tk_call_without_enc(cmd, @path, *hash_kv(keys, true))
+            begin
+              tk_call_without_enc('destroy', @path)
+            rescue
+              # cannot destroy
+              configure(keys)
+            else
+              # re-create widget
+              tk_call_without_enc(cmd, @path, *hash_kv(keys, true))
+            end
           end
         end
       end
@@ -5341,7 +5348,7 @@ TkWidget = TkWindow
 #Tk.freeze
 
 module Tk
-  RELEASE_DATE = '2008-04-15'.freeze
+  RELEASE_DATE = '2008-04-18'.freeze
 
   autoload :AUTO_PATH,        'tk/variable'
   autoload :TCL_PACKAGE_PATH, 'tk/variable'
diff --git a/ext/tk/lib/tk/scale.rb b/ext/tk/lib/tk/scale.rb
index bf2791ec55..7e758d92f4 100644
--- a/ext/tk/lib/tk/scale.rb
+++ b/ext/tk/lib/tk/scale.rb
@@ -26,9 +26,16 @@ class Tk::Scale<TkWindow
           tk_call_without_enc(self.class::TkCommandNames[0], @path)
           keys = __check_available_configure_options(keys)
           unless keys.empty?
-            tk_call_without_enc('destroy', @path)
-            tk_call_without_enc(self.class::TkCommandNames[0], @path, 
-                                *hash_kv(keys, true))
+            begin
+              tk_call_without_enc('destroy', @path)
+            rescue
+              # cannot destroy
+              configure(keys)
+            else
+              # re-create widget
+              tk_call_without_enc(self.class::TkCommandNames[0], @path, 
+                                  *hash_kv(keys, true))
+            end
           end
         end
       end
diff --git a/ext/tk/lib/tk/scrollbar.rb b/ext/tk/lib/tk/scrollbar.rb
index 521fc7e400..87db46a9f9 100644
--- a/ext/tk/lib/tk/scrollbar.rb
+++ b/ext/tk/lib/tk/scrollbar.rb
@@ -31,9 +31,16 @@ class Tk::Scrollbar<TkWindow
           tk_call_without_enc(self.class::TkCommandNames[0], @path)
           keys = __check_available_configure_options(keys)
           unless keys.empty?
-            tk_call_without_enc('destroy', @path)
-            tk_call_without_enc(self.class::TkCommandNames[0], @path, 
-                                *hash_kv(keys, true))
+            begin
+              tk_call_without_enc('destroy', @path)
+            rescue
+              # cannot destroy
+              configure(keys)
+            else
+              # re-create widget
+              tk_call_without_enc(self.class::TkCommandNames[0], @path, 
+                                  *hash_kv(keys, true))
+            end
           end
         end
       end
diff --git a/ext/tk/lib/tkextlib/blt/ted.rb b/ext/tk/lib/tkextlib/blt/ted.rb
index 39495842b4..8b727c1eec 100644
--- a/ext/tk/lib/tkextlib/blt/ted.rb
+++ b/ext/tk/lib/tkextlib/blt/ted.rb
@@ -34,7 +34,7 @@ module Tk::BLT
       private :itemconfiginfo, :current_itemconfiginfo
 
       def cget(master, option)
-        itemconfigure(master, slot, value)
+        itemcget(master, option)
       end
       def configure(master, slot, value=None)
         itemconfigure(master, slot, value)
diff --git a/ext/tk/lib/tkextlib/blt/unix_dnd.rb b/ext/tk/lib/tkextlib/blt/unix_dnd.rb
index 3130c1e56f..7a994233a2 100644
--- a/ext/tk/lib/tkextlib/blt/unix_dnd.rb
+++ b/ext/tk/lib/tkextlib/blt/unix_dnd.rb
@@ -34,7 +34,7 @@ module Tk::BLT
       private :itemconfiginfo, :current_itemconfiginfo
 
       def cget(win, option)
-        itemconfigure(['cget', win], slot, value)
+        itemcget(['cget', win], option)
       end
       def configure(win, slot, value=None)
         itemconfigure(['configure', win], slot, value)
@@ -46,8 +46,8 @@ module Tk::BLT
         current_itemconfiginfo(['configure', win], slot)
       end
 
-      def tokwn_cget(win, option)
-        itemconfigure(['token', 'cget', win], slot, value)
+      def token_cget(win, option)
+        itemcget(['token', 'cget', win], option)
       end
       def token_configure(win, slot, value=None)
         itemconfigure(['token', 'configure', win], slot, value)
diff --git a/ext/tk/lib/tkextlib/treectrl/tktreectrl.rb b/ext/tk/lib/tkextlib/treectrl/tktreectrl.rb
index b72b157dcd..d025bc4086 100644
--- a/ext/tk/lib/tkextlib/treectrl/tktreectrl.rb
+++ b/ext/tk/lib/tkextlib/treectrl/tktreectrl.rb
@@ -518,7 +518,8 @@ module Tk::TreeCtrl::ConfigMethod
 
   def notify_cget(win, pattern, option)
     pattern = "<#{pattern}>"
-    itemconfigure(['notify', [win, pattern]], option)
+    # "notify" doesn't have cget subcommand.
+    current_itemconfiginfo(['notify', [win, pattern]])[option.to_s]
   end
   def notify_configure(win, pattern, slot, value=None)
     pattern = "<#{pattern}>"
@@ -528,7 +529,10 @@ module Tk::TreeCtrl::ConfigMethod
     pattern = "<#{pattern}>"
     itemconfiginfo(['notify', [win, pattern]], slot)
   end
-  alias current_notify_configinfo notify_configinfo
+  def current_notify_configinfo(tagOrId, slot=nil)
+    pattern = "<#{pattern}>"
+    current_itemconfiginfo(['notify', [win, pattern]], slot)
+  end
 
   def style_cget(tagOrId, option)
     itemcget(['style', tagOrId], option)
diff --git a/ext/tk/lib/tkextlib/version.rb b/ext/tk/lib/tkextlib/version.rb
index 0fc1136e53..08cccf56c2 100644
--- a/ext/tk/lib/tkextlib/version.rb
+++ b/ext/tk/lib/tkextlib/version.rb
@@ -2,5 +2,5 @@
 # release date of tkextlib
 #
 module Tk
-  Tkextlib_RELEASE_DATE = '2008-04-14'.freeze
+  Tkextlib_RELEASE_DATE = '2008-04-18'.freeze
 end