diff --git a/lib/wx/core/enum.rb b/lib/wx/core/enum.rb
index e7e0d43c..6ecee62d 100644
--- a/lib/wx/core/enum.rb
+++ b/lib/wx/core/enum.rb
@@ -10,10 +10,23 @@ class Wx::Enum
 
   class << self
 
-    def enumerators
+    def set_non_distinct(lst)
+      raise TypeError, 'Expected Array of Symbols' unless lst.is_a?(Array) && lst.all? { |e| e.is_a?(Symbol) }
+      @non_distinct = lst
+    end
+    alias :non_distinct= :set_non_distinct
+
+    def non_distinct
+      @non_distinct || []
+    end
+
+    def enumerators(excludes = nil)
+      excludes ||= self.non_distinct
       self.constants(false).inject({}) do |tbl, cn|
-        cv = self.const_get(cn)
-        tbl[cv.to_i] = cn if self === cv
+        unless excludes&.include?(cn)
+          cv = self.const_get(cn)
+          tbl[cv.to_i] = cn if self === cv
+        end
         tbl
       end
     end
diff --git a/lib/wx/core/hboxsizer.rb b/lib/wx/core/hboxsizer.rb
index adba1e35..90e28e95 100644
--- a/lib/wx/core/hboxsizer.rb
+++ b/lib/wx/core/hboxsizer.rb
@@ -9,14 +9,34 @@
 # Just a shortcut version for creating a horizontal box sizer
 
 class Wx::HBoxSizer < Wx::BoxSizer
-  def initialize
-    super(Wx::HORIZONTAL)
+  def initialize(&block)
+    super(Wx::HORIZONTAL, &nil)
+    if block
+      if block.arity == -1 or block.arity == 0
+        self.instance_eval(&block)
+      elsif block.arity == 1
+        block.call(self)
+      else
+        Kernel.raise ArgumentError,
+                     "Block to initialize should accept a single argument or none"
+      end
+    end
   end
 end
 
 # Just a shortcut version for creating a horizontal wrap sizer
 class Wx::HWrapSizer < Wx::WrapSizer
-  def initialize(flags=Wx::WRAPSIZER_DEFAULT_FLAGS)
-    super(Wx::HORIZONTAL)
+  def initialize(flags=Wx::WRAPSIZER_DEFAULT_FLAGS, &block)
+    super(Wx::HORIZONTAL, &nil)
+    if block
+      if block.arity == -1 or block.arity == 0
+        self.instance_eval(&block)
+      elsif block.arity == 1
+        block.call(self)
+      else
+        Kernel.raise ArgumentError,
+                     "Block to initialize should accept a single argument or none"
+      end
+    end
   end
 end
diff --git a/lib/wx/core/sizer.rb b/lib/wx/core/sizer.rb
index d6ccaa49..b979b003 100644
--- a/lib/wx/core/sizer.rb
+++ b/lib/wx/core/sizer.rb
@@ -6,57 +6,184 @@
 # Copyright 2004-2007, wxRuby development team
 # released under the MIT-like wxRuby2 license
 
-# Class for automatically managing layouts
+# Classes for automatically managing layouts
 
-class Wx::Sizer
-  # Generic method to add items, supporting positional and named
-  # arguments
-  ADD_ITEM_PARAMS = [ Wx::Parameter[ :index, -1 ], 
-                      Wx::Parameter[ :proportion, 0 ],
-                      Wx::Parameter[ :flag, 0 ],
-                      Wx::Parameter[ :border, 0 ] ]
-  
-  def add_item(item, *mixed_args)
+module Wx
+  class Sizer
+    # Generic method to add items, supporting positional and named
+    # arguments
+    ADD_ITEM_PARAMS = [Wx::Parameter[:index, -1],
+                       Wx::Parameter[:proportion, 0],
+                       Wx::Parameter[:flag, 0],
+                       Wx::Parameter[:border, 0]]
 
-    begin
-      args = Wx::args_as_list(ADD_ITEM_PARAMS, *mixed_args)
-    rescue => err
-      err.set_backtrace(caller)
-      Kernel.raise err
+    def add_item(item, *mixed_args)
+
+      begin
+        args = Wx::args_as_list(ADD_ITEM_PARAMS, *mixed_args)
+      rescue => err
+        err.set_backtrace(caller)
+        Kernel.raise err
+      end
+
+      full_args = []
+
+      # extract the width and the height in the case of a spacer
+      # defined as an array
+      if item.kind_of?(Array)
+        Kernel.raise ArgumentError,
+                     "Invalid Sizer specification : [width, height] expected" if item.size != 2
+        full_args << item[0] << item[1]
+      else
+        full_args << item
+      end
+
+      # update the full arguments list with the optional arguments (except index)
+      idx = args.shift
+      full_args.concat(args)
+
+      # Call add to append if default position
+      if idx == -1
+        add(*full_args)
+      else
+        insert(idx, *full_args)
+      end
+    end
+
+    # Overload to provide Enumerator without block
+    wx_each_child = instance_method :each_child
+    define_method :each_child do |&block|
+      if block
+        wx_each_child.bind(self).call(&block)
+      else
+        ::Enumerator.new { |y| wx_each_child.bind(self).call { |c| y << c } }
+      end
+    end
+
+  end
+
+  class BoxSizer < Sizer
+
+    wx_initialize = instance_method :initialize
+    define_method :initialize do |*args, &block|
+      wx_initialize.bind(self).call(*args)
+      if block
+        if block.arity == -1 or block.arity == 0
+          self.instance_eval(&block)
+        elsif block.arity == 1
+          block.call(self)
+        else
+          Kernel.raise ArgumentError,
+                       "Block to initialize should accept a single argument or none"
+        end
+      end
+    end
+
+  end
+
+  class WrapSizer < BoxSizer
+
+    wx_initialize = instance_method :initialize
+    define_method :initialize do |*args, &block|
+      wx_initialize.bind(self).call(*args)
+      if block
+        if block.arity == -1 or block.arity == 0
+          self.instance_eval(&block)
+        elsif block.arity == 1
+          block.call(self)
+        else
+          Kernel.raise ArgumentError,
+                       "Block to initialize should accept a single argument or none"
+        end
+      end
     end
 
-    full_args = []
+  end
+
+  class StaticBoxSizer < BoxSizer
 
-    # extract the width and the height in the case of a spacer
-    # defined as an array
-    if item.kind_of?(Array)
-      Kernel.raise ArgumentError,
-        "Invalid Sizer specification : [width, height] expected" if item.size != 2
-      full_args << item[0] << item[1]
-    else
-      full_args << item
+    wx_initialize = instance_method :initialize
+    define_method :initialize do |*args, &block|
+      wx_initialize.bind(self).call(*args)
+      if block
+        if block.arity == -1 or block.arity == 0
+          self.instance_eval(&block)
+        elsif block.arity == 1
+          block.call(self)
+        else
+          Kernel.raise ArgumentError,
+                       "Block to initialize should accept a single argument or none"
+        end
+      end
     end
 
-    # update the full arguments list with the optional arguments (except index)
-    idx = args.shift
-    full_args.concat(args)
+  end
 
-    # Call add to append if default position
-    if idx == -1
-      add(*full_args)
-    else
-      insert(idx, *full_args)
+  class StdDialogButtonSizer < BoxSizer
+
+    wx_initialize = instance_method :initialize
+    define_method :initialize do |*args, &block|
+      wx_initialize.bind(self).call(*args)
+      if block
+        if block.arity == -1 or block.arity == 0
+          self.instance_eval(&block)
+        elsif block.arity == 1
+          block.call(self)
+        else
+          Kernel.raise ArgumentError,
+                       "Block to initialize should accept a single argument or none"
+        end
+      end
     end
+
   end
 
-  # Overload to provide Enumerator without block
-  wx_each_child = instance_method :each_child
-  define_method :each_child do |&block|
-    if block
-      wx_each_child.bind(self).call(&block)
-    else
-      ::Enumerator.new { |y| wx_each_child.bind(self).call { |c| y << c } }
+  class GridSizer < Sizer
+
+    wx_initialize = instance_method :initialize
+    define_method :initialize do |*args, &block|
+      wx_initialize.bind(self).call(*args)
+      self.instance_eval(&block) if block
     end
+
+  end
+
+  class FlexGridSizer < GridSizer
+
+    wx_initialize = instance_method :initialize
+    define_method :initialize do |*args, &block|
+      wx_initialize.bind(self).call(*args)
+      if block
+        if block.arity == -1 or block.arity == 0
+          self.instance_eval(&block)
+        elsif block.arity == 1
+          block.call(self)
+        else
+          Kernel.raise ArgumentError,
+                       "Block to initialize should accept a single argument or none"
+        end
+      end
+    end
+
+  end
+
+  class GridBagSizer < FlexGridSizer
+
+    wx_initialize = instance_method :initialize
+    define_method :initialize do |*args, &block|
+      wx_initialize.bind(self).call(*args)
+      if block
+        if block.arity == -1 or block.arity == 0
+          self.instance_eval(&block)
+        elsif block.arity == 1
+          block.call(self)
+        else
+          Kernel.raise ArgumentError,
+                       "Block to initialize should accept a single argument or none"
+        end
+      end
+    end
+
   end
 
 end
diff --git a/lib/wx/core/vboxsizer.rb b/lib/wx/core/vboxsizer.rb
index 18ba2ffe..ecd83284 100644
--- a/lib/wx/core/vboxsizer.rb
+++ b/lib/wx/core/vboxsizer.rb
@@ -9,14 +9,34 @@
 # Just a shortcut version for creating a vertical box sizer
 
 class Wx::VBoxSizer < Wx::BoxSizer
-  def initialize
-    super(Wx::VERTICAL)
+  def initialize(&block)
+    super(Wx::VERTICAL, &nil)
+    if block
+      if block.arity == -1 or block.arity == 0
+        self.instance_eval(&block)
+      elsif block.arity == 1
+        block.call(self)
+      else
+        Kernel.raise ArgumentError,
+                     "Block to initialize should accept a single argument or none"
+      end
+    end
   end
 end
 
 # Just a shortcut version for creating a vertical wrap sizer
 class Wx::VWrapSizer < Wx::WrapSizer
-  def initialize(flags=Wx::WRAPSIZER_DEFAULT_FLAGS)
-    super(Wx::VERTICAL)
+  def initialize(flags=Wx::WRAPSIZER_DEFAULT_FLAGS, &block)
+    super(Wx::VERTICAL, &nil)
+    if block
+      if block.arity == -1 or block.arity == 0
+        self.instance_eval(&block)
+      elsif block.arity == 1
+        block.call(self)
+      else
+        Kernel.raise ArgumentError,
+                     "Block to initialize should accept a single argument or none"
+      end
+    end
   end
 end
diff --git a/lib/wx/doc/enum.rb b/lib/wx/doc/enum.rb
index bb37187f..c7661207 100644
--- a/lib/wx/doc/enum.rb
+++ b/lib/wx/doc/enum.rb
@@ -18,6 +18,32 @@ module Wx
   # type safety for arguments requiring the specific enum class.
   class Enum < Numeric
 
+    class << self
+
+      # Sets a class specific list of enumerator ids (symbols) that should be considered
+      # non-distinctive enum values (examples would be convenience constants combining
+      # multiple distinctive enumerators or enumerators denoting the first/lowest and/or last/highest
+      # distinctive enumerators).
+      # @param [Array<Symbol>] lst
+      def set_non_distinct(lst) end
+      alias :non_distinct= :set_non_distinct
+
+      # Returns the class specific list of enumerator ids (symbols) that should be considered
+      # non-distinctive enum values. Returns nil if not set.
+      # @see set_non_distinct
+      # @return [Array<Symbol>,nil]
+      def non_distinct; end
+
+      # Returns a hash table with enumerator value : enumerator id (symbol) pairs for the enum class.
+      # @param [Array<Symbol>, nil] excludes list of enumerator ids (symbols) to exclude (by default the non_distinct list is used if defined)
+      # @return [Hash(Integer, Symbol)]
+      def enumerators(excludes = nil) end
+
+      # Returns the enumerator for the given enumerator symbol or nil if no such enumerator exists.
+      # @return [Wx::Enum, nil]
+      def [](enum_name) end
+    end
+
     # Initialize a new enum value.
     # @param [Integer] val enum integer value
     def initialize(val)end
diff --git a/lib/wx/version.rb b/lib/wx/version.rb
index bd442389..d5a95ff0 100644
--- a/lib/wx/version.rb
+++ b/lib/wx/version.rb
@@ -3,5 +3,5 @@
 # This software is released under the MIT license.
 
 module Wx
-  WXRUBY_VERSION    = '1.3.0'
+  WXRUBY_VERSION    = '1.3.1'
 end
diff --git a/rakelib/lib/director/textctrl.rb b/rakelib/lib/director/textctrl.rb
index 4943dcd5..800b7b71 100644
--- a/rakelib/lib/director/textctrl.rb
+++ b/rakelib/lib/director/textctrl.rb
@@ -24,6 +24,13 @@ def setup
           spec.ignore 'wxTextCtrl::GTKGetTextBuffer',
                       'wxTextCtrl::GTKGetEditable'
         end
+        if Config.instance.wx_version >= '3.3.0' && Config.instance.wx_port == :wxmsw
+          spec.items << 'wxTextSearch' << 'wxTextSearchResult'
+          spec.regard 'wxTextSearchResult::m_start', 'wxTextSearchResult::m_end'
+          spec.make_readonly 'wxTextSearchResult::m_start', 'wxTextSearchResult::m_end'
+          spec.rename_for_ruby 'start' => 'wxTextSearchResult::m_start',
+                               'end' => 'wxTextSearchResult::m_end'
+        end
         if Config.instance.wx_port == :wxqt
           # not implemented
           spec.ignore 'wxTextCtrl::OnDropFiles'
diff --git a/samples/dialogs/dialogs.rb b/samples/dialogs/dialogs.rb
index db4733bd..e3c61be2 100755
--- a/samples/dialogs/dialogs.rb
+++ b/samples/dialogs/dialogs.rb
@@ -167,7 +167,7 @@ def initialize(parent, pref_type)
       end
 
       create(parent, -1, "Preferences")
-      create_buttons(Wx::ID_OK|Wx::ID_CANCEL)
+      create_buttons(Wx::OK|Wx::CANCEL)
       book_ctrl.set_images(imgs)
       book_ctrl.add_page(file_panel(book_ctrl), "File", false, img_id1)
       book_ctrl.add_page(cdrom_panel(book_ctrl), "CD ROM", false, img_id2)