FileChooserButton.newWithDialog

Creates a #GtkFileChooserButton widget which uses dialog as its file-picking window.

Note that dialog must be a #GtkDialog (or subclass) which implements the #GtkFileChooser interface and must not have gtk.types.DialogFlags.DestroyWithParent set.

Also note that the dialog needs to have its confirmative button added with response gtk.types.ResponseType.Accept or gtk.types.ResponseType.Ok in order for the button to take over the file selected in the dialog.