add select method for spinbox

include/nana/gui/widgets/spinbox.hpp

@@ -103,6 +103,9 @@ namespace nana
 		std::pair<int, int> range_int() const;
 		std::pair<double, double> range_double() const;
 
+		/// Selects/unselects the text
+		void select(bool);
+
 		/// Gets the spined value
 		::std::string value() const;
 		void value(const ::std::string&);

source/gui/widgets/spinbox.cpp

@@ -696,6 +696,16 @@ namespace nana
 		return range->range();
 	}
 
+	void spinbox::select(bool sel)
+	{
+		internal_scope_guard lock;
+		if (handle())
+		{
+			get_drawer_trigger().impl()->editor()->select(sel);
+			API::refresh_window(*this);
+		}
+	}
+
 	::std::string spinbox::value() const
 	{
 		internal_scope_guard lock;