本例，在Excel右键菜单中创建一个按钮，按钮的标题使用getLabel动态获取，图标使用getImage动态获取。

customUI XML代码：

<customUI xmlns="http://schemas.microsoft.com/office/2009/07/customui" onLoad="OL">
    <contextMenus>
        <contextMenu idMso="ContextMenuCell">
            <button id="Button1" getLabel="GL" getImage="GI" insertBeforeMso="Cut"/>
        </contextMenu>
    </contextMenus>
</customUI>

工作簿中的VBA回调代码：

Public R As IRibbonUI
Public Sub OL(ribbon As Office.IRibbonUI)
Set R = ribbon
End Sub
Public Sub GL(control As Office.IRibbonControl, ByRef label)
label = Time
End Sub
Public Sub GI(control As Office.IRibbonControl, ByRef image)
Dim rnd As Integer
rnd = Application.WorksheetFunction.RandBetween(65, 90)
image = Chr(rnd)
End Sub

效果演示：

源文件下载 

右键菜单显示时间.rar

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