uiref / byon -- clean up use of dialog panel.

Change-Id: I9c4bb7c66910f4cc1126d862a15b97216d999dae
diff --git a/onos-byon-gui/src/main/resources/app/view/byonTopov/byonTopovService.js b/onos-byon-gui/src/main/resources/app/view/byonTopov/byonTopovService.js
index 908010b..1fedd6d 100644
--- a/onos-byon-gui/src/main/resources/app/view/byonTopov/byonTopovService.js
+++ b/onos-byon-gui/src/main/resources/app/view/byonTopov/byonTopovService.js
@@ -52,7 +52,7 @@
     }
 
     function dClose() {
-        $log.debug('Dialog OK button pressed');
+        $log.debug('Dialog Close button clicked (or Esc pressed)');
     }
 
     function processResponse(data) {
@@ -60,7 +60,7 @@
         tds.openDialog()
             .setTitle('Virtual Networks')
             .addContent(createListContent())
-            .addButton('Close', dClose, 'escape')
+            .addCancel(dClose, 'Close')
             .bindKeys();
     }
 
@@ -94,7 +94,8 @@
     }
 
     function handleEscape() {
-        // TODO: close the dialog
+        // Placeholder.
+        // If you consume an Escape key (to cancel something), return true.
         $log.debug("BYON escape");
         return false;
     }