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我試圖複製寫字板應用程序菜單並向RibbonApplicationMenu添加標題。但標題從不顯示。我在哪兒寫字板這個頭添加到應用程序菜單(如標題顯示「最近的文檔」如何將標題添加到MS Ribbon的應用程序菜單
<ribbon:RibbonApplicationSplitMenuItem Header="Select an Option to export" ImageSource="image1.png" >
<ribbon:RibbonApplicationMenuItem Header="PDF" ImageSource="image2.png" />
<ribbon:RibbonApplicationMenuItem Header="Excel" ImageSource="image3.png />
</ribbon:RibbonApplicationSplitMenuItem>