Merge pull request #7105 from paul-cheung/master

add open event for dialog(as build failed in TypeScript 1.7)

jqueryui/jqueryui.d.ts

@@ -362,7 +362,8 @@ declare module JQueryUI {
         title?: string;
         width?: any; // number or string
         zIndex?: number;
-
+		
+		open?: DialogEvent;
         close?: DialogEvent;
     }