Index: src/Plugins/Wti/Wti.Controller/PipingContextMenuStrip.cs
===================================================================
diff -u -re61dfe357a722430029affaa9a28e6bd2cbbc281 -r4eeb65b4d7a03f5151011baaa5bf461ee08baf63
--- src/Plugins/Wti/Wti.Controller/PipingContextMenuStrip.cs	(.../PipingContextMenuStrip.cs)	(revision e61dfe357a722430029affaa9a28e6bd2cbbc281)
+++ src/Plugins/Wti/Wti.Controller/PipingContextMenuStrip.cs	(.../PipingContextMenuStrip.cs)	(revision 4eeb65b4d7a03f5151011baaa5bf461ee08baf63)
@@ -14,7 +14,7 @@
         public PipingContextMenuStrip(PipingData pipingData)
         {
             this.pipingData = pipingData;
-            var calculateItem = new ToolStripButton(Resources.PipingDataContextMenuCalculate);
+            var calculateItem = new ToolStripMenuItem(Resources.PipingDataContextMenuCalculate);
             calculateItem.Click += CalculateItemClick;
             Items.Add(calculateItem);
         }