Dojo EnhancedGrid CoulmnSelector复选框样式

我创建dojo增强型datagrid的Javascript代码是：

grid = new dojox.grid.EnhancedGrid({
                            store: store,
                            rowSelector: 'auto',
                            **plugins: {indirectSelection: {headerSelector:true, width:'auto', styles:"text-align: center;"}},**
                            structure: [
                                          {field: 'msname', width: 'auto', name: 'Milestone'},
                                          {field: 'description', width: 'auto', name: 'Description'},
                                          {field: 'msorder', width: 'auto', name: 'Milestone Order'},
                                          {field: 'eventtype', width: 'auto', name: 'Event Type'},
                                          {field: 'isngrp', width: 'auto', name: 'Is NGRP?'},
                                          {field: 'eventAttribute', width: 'auto', name: 'Event Attribute(s)'}
                                      ]
                        },"grid");
                        grid.startup();

但是复选框的样式不正确。复选框内有一个小正方形。你知道怎么解决吗。截图为：

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我错过了包含在页面正文中的enhancedgrid.css。现在天气转晴了