Whats the difference between sending a widget a (SEL_COMMAND, FXWindow::ID_SHOW) message and just calling its show() method directly?
It’s an efficiency issue, related to the layout algorithm. In most cases, when a window gets the FXWindow::ID_SHOW message, the default handler calls show() and then calls recalc() to mark the window’s layout as “dirty” (i.e. scheduled for a re-layout). But since show() and hide() are themselves used in layout() in many cases, calling recalc() inside the implementation of show() and hide() would cause yet another layout() to happen.
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