Want to add custom button for picker to show options

[soberservicesguy]

Question

I want to remove the dropdown button and use my own for styling, can you please let me know the following: 1- How to hide the existing dropdown button (one hack is to put some bg color over it to hide but proper method would be appreciated) 2- What event / callback does that dropdown button fire so that I can use the same event for it

Thanks