• Always check the method arguments for the type/range of values you can supply. Over the years, internal validation has got stricter and errors may be thrown when they were silently ignored before.
  • If anything goes wrong, check the popup window/console. It should tell you where the code is that caused the error.
  • Never call window.Repaint() or window.RepaintRect() from the on_size callback.
  • Consider using Dispose() methods where you can to free up memory.
  • Remember to retrieve window.Width and window.Height in the on_size callback because their values during startup is not reliable.
  • You should not create objects inside the on_paint callback since it will be called frequently. For example, utils.LoadImage and fb.TitleFormat should never be used there. Ideally, these objects should be created once on startup.