Speed up startup time

SelectionLength takes a lot of time when loading fields, so only start
doing it when the form is totally loaded.

PKX/f1-Main.cs

@@ -2069,6 +2069,8 @@ private void update_ID(object sender, EventArgs e)
         }
         private void validateComboBox(object sender)
         {
+            if (!formInitialized)
+                return;
             ComboBox cb = sender as ComboBox;
             if (cb == null) 
                 return;