根据属性的值启用/禁用按钮

I want to display the button only if the user that logs in has the value true for the sendSMS prperty. What should I place in the ng-show in the html to do that? Also I am not too sure if I placed the value for the property correctly. I created a Viewer model with the User as the base model and added a property called sendSMS so that I can use this property to enable/ disable the button.I want to display the button only if the user t