diff --git a/include/nana/gui/widgets/group.hpp b/include/nana/gui/widgets/group.hpp
index ba48928b..bf1cad74 100644
--- a/include/nana/gui/widgets/group.hpp
+++ b/include/nana/gui/widgets/group.hpp
@@ -3,8 +3,8 @@
  *	Nana C++ Library(http://www.nanaro.org)
  *	Copyright(C) 2015-2018 Jinhao(cnjinhao@hotmail.com)
  *
- *	Distributed under the Boost Software License, Version 1.0. 
- *	(See accompanying file LICENSE_1_0.txt or copy at 
+ *	Distributed under the Boost Software License, Version 1.0.
+ *	(See accompanying file LICENSE_1_0.txt or copy at
  *	http://www.boost.org/LICENSE_1_0.txt)
  *
  *	@file: nana/gui/widgets/group.hpp
@@ -71,9 +71,16 @@ namespace nana{
 		/// Enables/disables the radio mode which is single selection
 		group& radio_mode(bool);
 
-		/// Returns the index of option in radio_mode, it throws a logic_error if radio_mode is false.
+		/// Returns the index of selected option in radio_mode, it throws a logic_error if radio_mode is false.
 		std::size_t option() const;
 
+        /** Set check/unchecked status of specified option
+            @param[in] pos zero-based index of option to set
+            @param[in] check status required, defaults to checked
+            throws an out_of_range if !(pos < number of options)
+        */
+        void option_check( std::size_t pos, bool check = true );
+
 		/// Determines whether a specified option is checked, it throws an out_of_range if !(pos < number of options)
 		bool option_checked(std::size_t pos) const;
 
diff --git a/source/gui/widgets/group.cpp b/source/gui/widgets/group.cpp
index 6d697a62..500c8ba6 100644
--- a/source/gui/widgets/group.cpp
+++ b/source/gui/widgets/group.cpp
@@ -3,8 +3,8 @@
  *	Nana C++ Library(http://www.nanaro.org)
  *	Copyright(C) 2015-2018 Jinhao(cnjinhao@hotmail.com)
  *
- *	Distributed under the Boost Software License, Version 1.0. 
- *	(See accompanying file LICENSE_1_0.txt or copy at 
+ *	Distributed under the Boost Software License, Version 1.0.
+ *	(See accompanying file LICENSE_1_0.txt or copy at
  *	http://www.boost.org/LICENSE_1_0.txt)
  *
  *	@file: nana/gui/widgets/group.cpp
@@ -14,7 +14,7 @@
  *	@brief group is a widget used to visually group and layout other widgets.
  *
  * 	@contributor:
- *		dankan1890(https://github.com/dankan1890) 
+ *		dankan1890(https://github.com/dankan1890)
  */
 
 
@@ -197,6 +197,12 @@ namespace nana{
 		throw std::logic_error("the radio_mode of the group is disabled");
 	}
 
+    void group::option_check( std::size_t pos, bool check )
+    {
+ 		_THROW_IF_EMPTY();
+		return impl_->options.at(pos)->check( check );
+    }
+
 	bool group::option_checked(std::size_t pos) const
 	{
 		_THROW_IF_EMPTY();