ついでに。allocating and deleting wxWindows objects.(前半にょ)
> In general, classes derived from wxWindow must dynamically allocated with new and deleted with delete. If you delete a window, all of its children and descendants will be automatically deleted, so you don't need to delete these descendants explicitly.
> When deleting a frame or dialog, use Destroy rather than delete so that the wxWindows delayed deletion can take effect. This waits until idle time (when all messages have been processed) to actually delete the window, to avoid problems associated with the GUI sending events to deleted windows.
