Created the project and put a button on the Layout and exported to the cocoon and launched smartphone game and missing button.
What's the problem?
Develop games in your browser. Powerful, performant & highly capable.
It's not a problem. The form control plugins Textbox and Button are not supported. Read "How to export to CocoonJS" article: scirra.com/tutorials/303/how-to-export-to-cocoonjs