Control visibility of a button (hide /show)

Create a service where you can call 

var result = Resources["CurrentSessionInfo"].GetCurrentUserGroups();

It returns an infotable :

Code for your service ( it returns a boolean ). the "userAdmin" string may be passed as a parameter, 

var resultGrp = Resources["CurrentSessionInfo"].GetCurrentUserGroups();
var tableLength = resultGrp.rows.length;

var result = false;
for (var x=0; x < tableLength; x++) {
 var row = resultGrp.rows[x];
 if("userAdmin" == row.name){ 
 result=true;
 break;
 }
}

Next, some bindings :

And it works 🙂