diff --git a/include/nana/deploy.hpp b/include/nana/deploy.hpp
index 069545cb..0f7cb8c9 100644
--- a/include/nana/deploy.hpp
+++ b/include/nana/deploy.hpp
@@ -119,6 +119,12 @@ namespace nana
 	void throw_not_utf8(const char*, unsigned len);
 	void throw_not_utf8(const char*);
 
+	/// this text needed change, it needed review ??
+	bool review_utf8(const std::string& text);
+
+	/// this text needed change, it needed review ??
+	bool review_utf8(std::string& text);
+
 	const std::string& to_utf8(const std::string&);
 	std::string to_utf8(const std::wstring&);
 
diff --git a/source/deploy.cpp b/source/deploy.cpp
index ba6a0907..0e6b0faf 100644
--- a/source/deploy.cpp
+++ b/source/deploy.cpp
@@ -513,19 +513,13 @@ namespace nana
 		return true;
 	}
 
+	/// move to *.h ??
 	struct utf8_Error : std::runtime_error
 	{
 		static bool use_throw; ///< def { true }; use carefully - it is a global variable !! \todo initialize from a #define ?
-
-		utf8_Error(const std::string& what_arg)
-			:std::runtime_error{ std::string("\nRun-time utf8 Error: ") + what_arg }
-		{}
-
-		utf8_Error(const char * what_arg)
-			:utf8_Error{ std::string(what_arg) }
-		{}
-
-
+		
+		using std::runtime_error::runtime_error;
+		
 		void emit()
 		{
 			if (use_throw)
@@ -541,8 +535,6 @@ namespace nana
 	{
 		if (!is_utf8(text.c_str(), text.length()))
 			return utf8_Error(std::string("The text is not encoded in UTF8: ") + text).emit();
-
-			//throw std::invalid_argument(  std::string("The text is not encoded in UTF8: ")+text  ) ;
 	}
 
 	void throw_not_utf8(const char* text, unsigned len)
@@ -562,6 +554,38 @@ namespace nana
 		
 	}
 
+	std::string recode_to_utf8(std::string no_utf8)
+	{
+		return nana::charset(no_utf8).to_bytes(nana::unicode::utf8);
+	}
+
+	/// this text needed change, it needed review ??
+	bool review_utf8(const std::string& text)
+	{
+		if (!is_utf8(text.c_str(), text.length()))
+		{
+			utf8_Error(std::string("The text is not encoded in UTF8: ") + text).emit();
+			return true;   /// it needed change, it needed review !!
+		}
+		else
+			return false;
+	}
+
+	/// this text needed change, it needed review ??
+	bool review_utf8(std::string& text)
+	{
+		if (!is_utf8(text.c_str(), text.length()))
+		{
+			utf8_Error(std::string("The text is not encoded in UTF8: ") + text).emit();
+			text.swap(recode_to_utf8(text));
+			return true;   /// it needed change, it needed review !!
+		}
+		else
+			return false;
+	}
+
+
+
 	const std::string& to_utf8(const std::string& str)
 	{
 		return str;
diff --git a/source/gui/msgbox.cpp b/source/gui/msgbox.cpp
index 8d4914f6..e3accf06 100644
--- a/source/gui/msgbox.cpp
+++ b/source/gui/msgbox.cpp
@@ -355,13 +355,15 @@ namespace nana
 	msgbox::msgbox(const std::string& title)
 		: wd_(nullptr), title_(title), button_(ok), icon_(icon_none)
 	{
-		throw_not_utf8(title_);
+		// throw_not_utf8(title_);
+		review_utf8(title_);
 	}
 
 	msgbox::msgbox(window wd, const std::string& title, button_t b)
 		: wd_(wd), title_(title), button_(b), icon_(icon_none)
 	{
-		throw_not_utf8(title_);
+		// throw_not_utf8(title_);
+		review_utf8(title_);
 	}
 
 	msgbox& msgbox::icon(icon_t ic)
diff --git a/source/gui/widgets/listbox.cpp b/source/gui/widgets/listbox.cpp
index 56eff953..405e88a4 100644
--- a/source/gui/widgets/listbox.cpp
+++ b/source/gui/widgets/listbox.cpp
@@ -3148,6 +3148,7 @@ namespace nana
 							{
 								auto cell_txtcolor = fgcolor;
 								auto & m_cell = item.cells[column_pos];
+								review_utf8(m_cell.text);
 								nana::size ts = graph->text_extent_size(m_cell.text);        // precalcule text geometry
 
 								if (m_cell.custom_format && (!m_cell.custom_format->bgcolor.invisible()))  // adapt to costum format if need