Java Can'；t添加两个标题面板

我正在编写GWT客户端。 这是我的密码：

<g:center type="g:SingleChildWidgetType">
        <g:CaptionPanel captionText="Foreign Data" ui:field="cpForeignData">
            <g:ResizeLayoutPanel width="100%" height="100%">
                <p2:DataGrid ui:field="dataForeign" width="100%" height="100%" />
            </g:ResizeLayoutPanel>
        </g:CaptionPanel>
        <g:CaptionPanel captionText="Merged Data" ui:field="cpMergedData">
            <g:ResizeLayoutPanel width="100%" height="100%">
                <p2:DataGrid width="100%" height="100%" ui:field="dataMerged" />
            </g:ResizeLayoutPanel>
        </g:CaptionPanel>
    </g:center>

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有人知道这个问题的解决方案吗？

g:center只接受一个子元素。尝试将CaptionPanel包装在一个符合您需要的容器中，例如VerticalPanel:

<g:center type="g:SingleChildWidgetType">
    <g:VerticalPanel>
        <g:CaptionPanel captionText="Foreign Data" ui:field="cpForeignData">
            <g:ResizeLayoutPanel width="100%" height="100%">
                <p2:DataGrid ui:field="dataForeign" width="100%" height="100%" />
            </g:ResizeLayoutPanel>
        </g:CaptionPanel>
        <g:CaptionPanel captionText="Merged Data" ui:field="cpMergedData">
            <g:ResizeLayoutPanel width="100%" height="100%">
                <p2:DataGrid width="100%" height="100%" ui:field="dataMerged" />
            </g:ResizeLayoutPanel>
        </g:CaptionPanel>
    </g:VerticalPanel>
</g:center>

---

g:center只接受一个子元素。尝试将CaptionPanel包装在一个符合您需要的容器中，例如VerticalPanel:

<g:center type="g:SingleChildWidgetType">
    <g:VerticalPanel>
        <g:CaptionPanel captionText="Foreign Data" ui:field="cpForeignData">
            <g:ResizeLayoutPanel width="100%" height="100%">
                <p2:DataGrid ui:field="dataForeign" width="100%" height="100%" />
            </g:ResizeLayoutPanel>
        </g:CaptionPanel>
        <g:CaptionPanel captionText="Merged Data" ui:field="cpMergedData">
            <g:ResizeLayoutPanel width="100%" height="100%">
                <p2:DataGrid width="100%" height="100%" ui:field="dataMerged" />
            </g:ResizeLayoutPanel>
        </g:CaptionPanel>
    </g:VerticalPanel>
</g:center>