Hi Reinaldo,
We are happy to announce that your idea has been implemented and made available with the Oct 02nd release.
Below you will find a short description of the Native Dropdown Widget capability, from our "Reactive Web: The Next Generation of Web Apps" forum post.
Native Dropdown widget

The Dropdown Widget has a new property Options Content, which you can set to Text Only or Custom. Text Only gives a native look and feel of the dropdown lists in your reactive web and mobile apps. Set Options Content property to Custom to build a dropdown with a list of images or other widgets.
Thanks again for sharing your idea!
Cheers!