FTR: deleting a widget and removing it from its parent (Fl_Group) is as simple as delete w;. This is documented, for instance in the destructor (~Fl_Widget) docs.

There are some details in the docs of Fl::delete_widget() as well. The automatic removal from its parent group was obviously (as documented) introduced in 1.3.0.

Side note: Fl::delete_widget() should no longer be necessary since FLTK 1.3.x (which exact x I do not know). It has always only be recommended if you wanted to delete a widget in its own callback (directly or indirectly [1]), but I hope that this is no longer necessary because we fixed the access-after-delete issues we had in 1.1.x. However, there's no official guarantee. Personally I would always call delete w in FLTK 1.4 (and 1.3) rather than using Fl::delete_widget(w);.

[1] with indirectly I mean deleting one of the parents of a widget which would recursively delete the widget itself, e.g. delete button->parent() or something like that.

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