1 files changed, 7 insertions, 0 deletions
diff --git a/ext/tk/lib/tk/scrollbar.rb b/ext/tk/lib/tk/scrollbar.rb
index 0ee4423c9a..8d4d40322d 100644
--- a/ext/tk/lib/tk/scrollbar.rb
+++ b/ext/tk/lib/tk/scrollbar.rb
@@ -41,6 +41,7 @@ class TkScrollbar<TkWindow
 	w.yscrollcommand proc{|first, last| self.set(first, last)}
       end
     }
+    Tk.update  # avoid scrollbar trouble
     self
   end
 
@@ -52,6 +53,12 @@ class TkScrollbar<TkWindow
     fail RuntimeError, "not depend on the assigned_list"
   end
 
+  def configure(*args)
+    ret = super(*args)
+    # Tk.update  # avoid scrollbar trouble
+    ret
+  end
+
   #def delta(deltax=None, deltay=None)
   def delta(deltax, deltay)
     number(tk_send_without_enc('delta', deltax, deltay))