diff --git a/reference/ArrayCtrlSorting/ArrayCtrlSorting.upp b/reference/ArrayCtrlSorting/ArrayCtrlSorting.upp
new file mode 100644
index 000000000..d8b7ae78f
--- /dev/null
+++ b/reference/ArrayCtrlSorting/ArrayCtrlSorting.upp
@@ -0,0 +1,11 @@
+description "Sorting ArrayCtrl by column clicks\377";
+
+uses
+	CtrlLib;
+
+file
+	main.cpp;
+
+mainconfig
+	"" = "GUI";
+
diff --git a/reference/ArrayCtrlSorting/main.cpp b/reference/ArrayCtrlSorting/main.cpp
new file mode 100644
index 000000000..4a5153a83
--- /dev/null
+++ b/reference/ArrayCtrlSorting/main.cpp
@@ -0,0 +1,26 @@
+#include <CtrlLib/CtrlLib.h>
+
+using namespace Upp;
+
+GUI_APP_MAIN
+{
+	ArrayCtrl list;
+	
+	list.AddColumn("Column1").Sorting(); // default sorting
+	list.AddColumn("Column2") // we provide compare function that sorts based on string length
+		.Sorting([](const Value& a, const Value& b) -> int {
+			return SgnCompare(AsString(a).GetCount(), AsString(b).GetCount());
+		});
+	
+	list.Add("Not sorted");
+
+	for(int i = 0; i < 100; i++)
+		list.Add((int)Random(), (int)Random(), (int)Random());
+	
+	list.SortingFrom(1);
+	
+	TopWindow win;
+	win.Add(list.SizePos());
+	
+	win.Run();
+}
diff --git a/reference/MtRpcServer/MtRpcServer.cpp b/reference/MtRpcServer/MtRpcServer.cpp
index 1e0a3a23f..e8d2cab97 100644
--- a/reference/MtRpcServer/MtRpcServer.cpp
+++ b/reference/MtRpcServer/MtRpcServer.cpp
@@ -42,7 +42,7 @@ private:
 	void Process(int n)
 	{
 		INTERLOCKED { LOG("Process " << n << " started"); }
-		Mutex accept_mutex;
+		static Mutex accept_mutex;
 		
 		for(;;)
 		{