Ticket #4361: 4361.patch

_source/core/ui.js

@@ -75 +75 @@
                 if ( command )
                         command.uiItems.push( result );
 
+                // Replace ui item definitions with created ui instances(#4361).
+                this._.items[ name ] = result;
+
                 return result;
         },
 

_source/plugins/toolbar/plugin.js

@@ -201 +201 @@
                                                                         }
 
                                                                         var itemObj = item.render( editor, output );
+                                                                        // Associate toolbar item instance with UI object (#4361).
+                                                                        item.toolbarItem = itemObj;
                                                                         index = toolbarObj.items.push( itemObj ) - 1;
 
                                                                         if ( index > 0 )