diff --git a/code/nel/include/nel/gui/group_header.h b/code/nel/include/nel/gui/group_header.h
index 5988a06f5..444291b8a 100644
--- a/code/nel/include/nel/gui/group_header.h
+++ b/code/nel/include/nel/gui/group_header.h
@@ -43,6 +43,7 @@ namespace NLGUI
 		CGroupHeader(const TCtorParam &param);
 
 		std::string getProperty( const std::string &name ) const;
+		void setProperty( const std::string &name, const std::string &value );
 
 		// from CInterfaceGroup
 		virtual bool parse(xmlNodePtr cur, CInterfaceGroup * parentGroup);
diff --git a/code/nel/src/gui/group_header.cpp b/code/nel/src/gui/group_header.cpp
index 961e877de..834f089ae 100644
--- a/code/nel/src/gui/group_header.cpp
+++ b/code/nel/src/gui/group_header.cpp
@@ -225,6 +225,19 @@ namespace NLGUI
 			return CGroupList::getProperty( name );
 	}
 
+	void CGroupHeader::setProperty( const std::string &name, const std::string &value )
+	{
+		if( name == "header_max_size" )
+		{
+			sint32 i;
+			if( fromString( value, i ) )
+				_HeaderMaxSize = i;
+			return;
+		}
+		else
+			return CGroupList::setProperty( name, value );
+	}
+
 	// *****************************************************************************************************************
 	bool CGroupHeader::parse(xmlNodePtr cur, CInterfaceGroup * parentGroup)
 	{