How to change the colors buttons in dialog API ?

I would like to change the colors buttons in dialog API from blue (btn-default) to red (btn-danger), I tried using pageObj.getItemButton and pageObj.findItem
Somebody know how to do it?

https://xlinesoft.com/phprunner/docs/images/dialog_api_lookup.png







https://xlinesoft.com/phprunner/docs/images/dialog_api_radio.png