Office365 要在office excel功能区（自定义选项卡）上使用工具提示

我在office加载项中添加了一个menifest.xml文件，它是在“自定义”选项卡上创建的，但现在我使用下面的代码获取该自定义选项卡上的工具提示。这个代码对我不起作用

<Control xsi:type="Button" id="Contoso.FunctionButton">
                  <!--Label for your button. resid must point to a ShortString resource -->
                  <Label resid="Contoso.FunctionButton.Label" />
                  <Supertip>
                    <!--ToolTip title. resid must point to a ShortString resource -->
                    <Title resid="Contoso.FunctionButton.Label" />
                    <!--ToolTip description. resid must point to a LongString resource -->
                    <Description resid="Contoso.FunctionButton.Tooltip" />
                  </Supertip>
                  <Icon>
                    <bt:Image size="16" resid="Contoso.FunctionButton.Icon" />
                    <bt:Image size="32" resid="Contoso.FunctionButton.Icon" />
                    <bt:Image size="80" resid="Contoso.FunctionButton.Icon" />
                  </Icon>
                  <!--This is what happens when the command is triggered (E.g. click on the Ribbon). Supported actions are ExecuteFunction or ShowTaskpane-->
                  <!--Look at the FunctionFile.html page for reference on how to implement the function -->
                  <Action xsi:type="ExecuteFunction">
                    <!--Name of the function to call. This function needs to exist in the global DOM namespace of the function file-->
                    <FunctionName>writeText</FunctionName>
                  </Action>
                </Control>

writeText

在什么意义上它不起作用？工具提示是否不显示？您是使用桌面Office还是Office Online进行测试？在Windows或Mac上？我们正在Windows上的在线（office.com）excel上进行测试。是工具提示不出现您使用的浏览器和操作系统是什么？Office加载项不支持chrome最新版本或IE10和windows 7IE 10。你看到Windows 10上带有Chrome的工具提示了吗？

<bt:ShortStrings>
        <bt:String id="Contoso.FunctionButton.Label" DefaultValue="Execute Function" />
        <bt:String id="Contoso.TaskpaneButton.Label" DefaultValue="Show Taskpane" />
        <bt:String id="Contoso.Dropdown.Label" DefaultValue="Dropdown" />
        <bt:String id="Contoso.Item1.Label" DefaultValue="Show Taskpane 1" />
        <bt:String id="Contoso.Item2.Label" DefaultValue="Show Taskpane 2" />
        <bt:String id="Contoso.Tab1.GroupLabel" DefaultValue="Test Group" />
         <bt:String id="Contoso.Tab1.TabLabel" DefaultValue="Test Tab" />
      </bt:ShortStrings>
      <bt:LongStrings>
        <bt:String id="Contoso.FunctionButton.Tooltip" DefaultValue="Click to Execute Function" />
        <bt:String id="Contoso.TaskpaneButton.Tooltip" DefaultValue="Click to Show a Taskpane" />
        <bt:String id="Contoso.Dropdown.Tooltip" DefaultValue="Click to Show Options on this Menu" />
        <bt:String id="Contoso.Item1.Tooltip" DefaultValue="Click to Show Taskpane1" />
        <bt:String id="Contoso.Item2.Tooltip" DefaultValue="Click to Show Taskpane2" />
      </bt:LongStrings>