diff --git a/include/nana/gui/widgets/group.hpp b/include/nana/gui/widgets/group.hpp
index 6188ccce..d62a7abf 100644
--- a/include/nana/gui/widgets/group.hpp
+++ b/include/nana/gui/widgets/group.hpp
@@ -35,7 +35,10 @@ namespace nana{
 	}//end namespace drawerbase
 
 	class group
-		: public widget_object<category::widget_tag, drawerbase::panel::drawer, general_events, drawerbase::group::scheme>
+		: public widget_object<category::widget_tag,
+		                       drawerbase::panel::drawer,
+		                       general_events,
+		                       drawerbase::group::scheme>
 	{
 		struct implement;
 	public:
diff --git a/include/nana/gui/widgets/listbox.hpp b/include/nana/gui/widgets/listbox.hpp
index 1d9cdec0..52680582 100644
--- a/include/nana/gui/widgets/listbox.hpp
+++ b/include/nana/gui/widgets/listbox.hpp
@@ -1292,7 +1292,10 @@ the nana::detail::basic_window member pointer scheme
 \example listbox_Resolver.cpp
 */
 	class listbox
-		:	public widget_object<category::widget_tag, drawerbase::listbox::trigger, drawerbase::listbox::listbox_events, drawerbase::listbox::scheme>,
+		:	public widget_object<category::widget_tag,
+		                         drawerbase::listbox::trigger,
+		                         drawerbase::listbox::listbox_events,
+		                         drawerbase::listbox::scheme>,
 			public concepts::any_objective<drawerbase::listbox::size_type, 2>
 	{
 	public:
diff --git a/include/nana/gui/widgets/spinbox.hpp b/include/nana/gui/widgets/spinbox.hpp
index d1f779e0..2f489f1d 100644
--- a/include/nana/gui/widgets/spinbox.hpp
+++ b/include/nana/gui/widgets/spinbox.hpp
@@ -77,7 +77,10 @@ namespace nana
 
 	/// Spinbox Widget
 	class spinbox
-		: public widget_object <category::widget_tag, drawerbase::spinbox::drawer, drawerbase::spinbox::spinbox_events, ::nana::widgets::skeletons::text_editor_scheme>
+		: public widget_object <category::widget_tag,
+		                        drawerbase::spinbox::drawer,
+		                        drawerbase::spinbox::spinbox_events,
+		                        ::nana::widgets::skeletons::text_editor_scheme>
 	{
 	public:
 		/// Constructs a spinbox.
diff --git a/include/nana/gui/widgets/treebox.hpp b/include/nana/gui/widgets/treebox.hpp
index fd48b022..4d832c27 100644
--- a/include/nana/gui/widgets/treebox.hpp
+++ b/include/nana/gui/widgets/treebox.hpp
@@ -350,7 +350,9 @@ namespace nana
     /// \brief  Displays a hierarchical list of items, such as the files and directories on a disk.
     /// See also in [documentation](http://nanapro.org/en-us/documentation/widgets/treebox.htm)
     class treebox
-		:public widget_object <category::widget_tag, drawerbase::treebox::trigger, drawerbase::treebox::treebox_events, drawerbase::treebox::scheme>
+		:public widget_object < category::widget_tag,
+		                        drawerbase::treebox::trigger,
+		                        drawerbase::treebox::treebox_events>
 	{
 	public:
         /// A type refers to the item and is also used to iterate through the nodes.