initialize scroller before the menu opened

apps/documenteditor/main/app/view/Toolbar.js

@@ -727,13 +727,15 @@ define([
                     items: [],
                     maxHeight   : 600,
                     restoreHeight: 600
-                }).on('render:after', function(mnu) {
+                }).on('show:before', function(mnu) {
+                    if ( !this.scroller ) {
                         this.scroller = new Common.UI.Scroller({
                             el: $(this.el).find('.dropdown-menu '),
                             useKeyboard: this.enableKeyEvents && !this.handleSelect,
-                        minScrollbarLength  : 40,
+                            minScrollbarLength: 40,
                             alwaysVisibleY: true
                         });
+                    }
                 }).on('show:after', function(btn, e) {
                     var mnu = $(this.el).find('.dropdown-menu '),
                         docH = $(document).height(),
@@ -1549,7 +1551,7 @@ define([
                 this.mnuColorSchema = new Common.UI.Menu({
                     maxHeight   : 600,
                     restoreHeight: 600
-                }).on('render:after', function(mnu) {
+                }).on('show:before', function(mnu) {
                         this.scroller = new Common.UI.Scroller({
                         el: $(this.el).find('.dropdown-menu '),
                         useKeyboard: this.enableKeyEvents && !this.handleSelect,