Fixed the bug where some files would not work, and now you can click on the tiles

NonoGramme/Form1.cs

@@ -67,6 +67,7 @@ namespace NonoGramme
 
             if (Directory.Exists(selectedFolder))
             {
+                lsbFiles.Items.Clear();
                 string[] nonFiles = Directory.GetFiles(selectedFolder, "*.non");
 
                 foreach (string file in nonFiles)
@@ -86,5 +87,16 @@ namespace NonoGramme
                 RefreshUi();
             }
         }
+
+        private void nonogramme1_Click(object sender, EventArgs e)
+        {
+            //The problem with click is that it is called 2 times because it detects mouse down AND ouse up
+        }
+
+        private void nonogramme1_MouseDown(object sender, MouseEventArgs e)
+        {
+            nonogramme1.CursorClick(nonogramme1.PointToClient(MousePosition));
+            RefreshUi();
+        }
     }
 }