diff --git a/wp-includes/js/customize-preview-widgets.js b/wp-includes/js/customize-preview-widgets.js
index 92267e88fb..f9828295fc 100644
--- a/wp-includes/js/customize-preview-widgets.js
+++ b/wp-includes/js/customize-preview-widgets.js
@@ -2,8 +2,7 @@
 
 	if ( ! wp || ! wp.customize ) { return; }
 
-	var api = wp.customize,
-		OldPreview;
+	var api = wp.customize;
 
 	/**
 	 * wp.customize.WidgetCustomizerPreview
@@ -20,6 +19,8 @@
 
 		init: function () {
 			var self = this;
+
+			this.preview = api.preview;
 			this.buildWidgetSelectors();
 			this.highlightControls();
 
@@ -104,17 +105,6 @@
 		}
 	};
 
-	/**
-	 * Capture the instance of the Preview since it is private
-	 */
-	OldPreview = api.Preview;
-	api.Preview = OldPreview.extend( {
-		initialize: function( params, options ) {
-			api.WidgetCustomizerPreview.preview = this;
-			OldPreview.prototype.initialize.call( this, params, options );
-		}
-	} );
-
 	$(function () {
 		var settings = window._wpWidgetCustomizerPreviewSettings;
 		if ( ! settings ) {
diff --git a/wp-includes/js/customize-preview-widgets.min.js b/wp-includes/js/customize-preview-widgets.min.js
index 6659171bbc..4ce0729805 100644
--- a/wp-includes/js/customize-preview-widgets.min.js
+++ b/wp-includes/js/customize-preview-widgets.min.js
@@ -1 +1 @@
-!function(a,b){if(a&&a.customize){var c,d=a.customize;d.WidgetCustomizerPreview={renderedSidebars:{},renderedWidgets:{},registeredSidebars:[],registeredWidgets:{},widgetSelectors:[],preview:null,l10n:{},init:function(){var a=this;this.buildWidgetSelectors(),this.highlightControls(),this.preview.bind("highlight-widget",a.highlightWidget)},buildWidgetSelectors:function(){var a=this;b.each(this.registeredSidebars,function(c,d){var e,f,g,h=[d.before_widget.replace("%1$s","").replace("%2$s",""),d.before_title,d.after_title,d.after_widget].join("");e=b(h),f=e.prop("tagName"),g=e.prop("className"),g&&(g=g.replace(/^\s+|\s+$/g,""),g&&(f+="."+g.split(/\s+/).join(".")),a.widgetSelectors.push(f))})},highlightWidget:function(a){var c=b(document.body),d=b("#"+a);c.find(".widget-customizer-highlighted-widget").removeClass("widget-customizer-highlighted-widget"),d.addClass("widget-customizer-highlighted-widget"),setTimeout(function(){d.removeClass("widget-customizer-highlighted-widget")},500)},highlightControls:function(){var a=this,c=this.widgetSelectors.join(",");b(c).attr("title",this.l10n.widgetTooltip),b(document).on("mouseenter",c,function(){a.preview.send("highlight-widget-control",b(this).prop("id"))}),b(document).on("click",c,function(c){c.shiftKey&&(c.preventDefault(),a.preview.send("focus-widget-control",b(this).prop("id")))})}},c=d.Preview,d.Preview=c.extend({initialize:function(a,b){d.WidgetCustomizerPreview.preview=this,c.prototype.initialize.call(this,a,b)}}),b(function(){var a=window._wpWidgetCustomizerPreviewSettings;a&&(b.extend(d.WidgetCustomizerPreview,a),d.WidgetCustomizerPreview.init())})}}(window.wp,jQuery);
\ No newline at end of file
+!function(a,b){if(a&&a.customize){var c=a.customize;c.WidgetCustomizerPreview={renderedSidebars:{},renderedWidgets:{},registeredSidebars:[],registeredWidgets:{},widgetSelectors:[],preview:null,l10n:{},init:function(){var a=this;this.preview=c.preview,this.buildWidgetSelectors(),this.highlightControls(),this.preview.bind("highlight-widget",a.highlightWidget)},buildWidgetSelectors:function(){var a=this;b.each(this.registeredSidebars,function(c,d){var e,f,g,h=[d.before_widget.replace("%1$s","").replace("%2$s",""),d.before_title,d.after_title,d.after_widget].join("");e=b(h),f=e.prop("tagName"),g=e.prop("className"),g&&(g=g.replace(/^\s+|\s+$/g,""),g&&(f+="."+g.split(/\s+/).join(".")),a.widgetSelectors.push(f))})},highlightWidget:function(a){var c=b(document.body),d=b("#"+a);c.find(".widget-customizer-highlighted-widget").removeClass("widget-customizer-highlighted-widget"),d.addClass("widget-customizer-highlighted-widget"),setTimeout(function(){d.removeClass("widget-customizer-highlighted-widget")},500)},highlightControls:function(){var a=this,c=this.widgetSelectors.join(",");b(c).attr("title",this.l10n.widgetTooltip),b(document).on("mouseenter",c,function(){a.preview.send("highlight-widget-control",b(this).prop("id"))}),b(document).on("click",c,function(c){c.shiftKey&&(c.preventDefault(),a.preview.send("focus-widget-control",b(this).prop("id")))})}},b(function(){var a=window._wpWidgetCustomizerPreviewSettings;a&&(b.extend(c.WidgetCustomizerPreview,a),c.WidgetCustomizerPreview.init())})}}(window.wp,jQuery);
\ No newline at end of file
diff --git a/wp-includes/version.php b/wp-includes/version.php
index a06baa5a29..7422f95738 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.5-alpha-35782';
+$wp_version = '4.5-alpha-35783';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.