如果 someComponentVariable 是包含 DataGrid 的类的公共属性，则可以使用 outerDocument 从 component 访问它.

If someComponentVariable is a public property of the class enclosing DataGrid, you can use outerDocument to access it from a component.

<ns1:SidePanelBonus bonusName="{data.name}" description="{data.description}" 
    arrow="{outerDocument.someComponentVariable}">
</ns1:SidePanelBonus>   

请参阅 创建内联项目渲染器和编辑器 以了解有关 outerDocument

See the "using the Component tag" section in Creating inline item renderers and editors for more info about outerDocument