如何在wpf中更改RibbonApplicationMenuItem的宽度？

Question

在WPF功能区应用程序（.Net Framework 4）中，如何在菜单应用程序出现时更改RibbonApplicationMenuItem的宽度？

Answer 1

<r:RibbonDropDownButton >
<Label Content="Column Header1" Style="{StaticResource CatHeader}" />
<UniformGrid Columns="2">
     <r:RibbonApplicationMenuItem Header="Item1" Width="x"/>
     ... where x=value and so on
</UniformGrid>