Move submit homework to separate function. So we can call it separately.

EduNetworkBuilder/NetworkBuilder.cs

@@ -2034,7 +2034,7 @@ namespace EduNetworkBuilder
             UpdateMenu();
         }
 
-        private void submitHomeworkToolStripMenuItem_Click(object sender, EventArgs e)
+        private void SubmitHomework()
         {
             if (myNetwork.WhatFrom == null) return; //We cannot submit it
 
@@ -2046,6 +2046,11 @@ namespace EduNetworkBuilder
             UpdateMenu();
         }
 
+        private void submitHomeworkToolStripMenuItem_Click(object sender, EventArgs e)
+        {
+            SubmitHomework();
+        }
+
         private void markAsGradedToolStripMenuItem_Click(object sender, EventArgs e)
         {
             if (myNetwork.WhatFrom == null) return; //We cannot submit it