GtkCombo::disable_activate

警告！这个方法在 PHP-GTK 2 中被废弃， 并且不应当在新的代码中使用。

Stops the GtkCombo widget from showing the popup list when the GtkEntry emits the "activate" signal, i.e. when the Return key is pressed. This may be useful if, for example, you want the Return key to close a dialog instead.