调用CComboBox :: ShowDropDown后如何防止鼠标光标被隐藏？

In my MFC application, when I call CComboBox::ShowDropDown(), the mouse cursor is hidden until interaction with the combo box completes (when the combo box loses focus.) It doesn't reappear when the mouse is moved, like it does with edit boxes.In my MFC application, when I call CComboBox::S