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_DIALOG_DESTROY_WITH_PARENT set.
Also note that the dialog needs to have its confirmative button
added with response %GTK_RESPONSE_ACCEPT or %GTK_RESPONSE_OK in
order for the button to take over the file selected in the dialog.
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_DIALOG_DESTROY_WITH_PARENT set.
Also note that the dialog needs to have its confirmative button added with response %GTK_RESPONSE_ACCEPT or %GTK_RESPONSE_OK in order for the button to take over the file selected in the dialog.