diff --git a/wp-includes/js/tinymce/plugins/wpdialogs/js/wpdialog.js b/wp-includes/js/tinymce/plugins/wpdialogs/js/wpdialog.js
index a846fd0d6e..cb168ddfad 100644
--- a/wp-includes/js/tinymce/plugins/wpdialogs/js/wpdialog.js
+++ b/wp-includes/js/tinymce/plugins/wpdialogs/js/wpdialog.js
@@ -1,26 +1,25 @@
 (function($){
 	$.ui.dialog.prototype.options.closeOnEscape = false;
-	$.widget("wp.wpdialog", $.ui.dialog, {
-		options: {
-			closeOnEscape: false
-		},
+	$.widget('wp.wpdialog', $.ui.dialog, {
+		// Work around a bug in jQuery UI 1.9.1.
+		// http://bugs.jqueryui.com/ticket/8805
 		widgetEventPrefix: 'wpdialog',
 
 		open: function() {
 			var ed;
 
-			// Initialize tinyMCEPopup if it exists and is the editor is active.
+			// Initialize tinyMCEPopup if it exists and the editor is active.
 			if ( tinyMCEPopup && typeof tinyMCE != 'undefined' && ( ed = tinyMCE.activeEditor ) && !ed.isHidden() ) {
 				tinyMCEPopup.init();
 			}
 
 			// Add beforeOpen event.
-			if ( this._isOpen || false === this._trigger('beforeOpen') ) {
+			if ( this.isOpen() || false === this._trigger('beforeOpen') ) {
 				return;
 			}
 
 			// Open the dialog.
-			$.ui.dialog.prototype.open.apply( this, arguments );
+			this._super();
 			// WebKit leaves focus in the TinyMCE editor unless we shift focus.
 			this.element.focus();
 			this._trigger('refresh');