assign id to jquery dialog button

The following (seemingly undocumented) works for me with jQuery 1.8.9:

$("#dlg").dialog({
  buttons :  { 
     "MyButton" : {
         text: "My Button",
         id: "my-button-id",
         click: function(){
             alert("here");
         }   
      } 
   }
});

The button can be addressed via $(“#my-button-id”)