Set Access key for Menu with underscore
<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<DockPanel>
<Menu DockPanel.Dock="Top">
<MenuItem Header="_Edit">
<MenuItem Header="Cu_t" Command="ApplicationCommands.Cut" />
<MenuItem Header="_Copy" Command="ApplicationCommands.Copy" />
<MenuItem Header="_Paste" Command="ApplicationCommands.Paste" />
</MenuItem>
</Menu>
<ToolBarTray DockPanel.Dock="Top">
<ToolBar>
<Button Command="Cut" Content="Cut" />
<Button Command="Copy" Content="Copy" />
<Button Command="Paste" Content="Paste" />
</ToolBar>
</ToolBarTray>
<TextBox />
</DockPanel>
</Page>
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