How do you create hotkeys for toolbar buttons in WPF?
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In WPF, you can make a button as follows:

    <Button Name="Foo" Content="_Foo" />

The underscore before the 'F' associates the `F` key with the `Foo` button (and adds an underline under the 'F' in 'Foo').

However, in a toolbar:

    <ToolBar>
        <Button Name="Foo" Content="_Foo" />
    </ToolBar>

This just creates a button with the text '_Foo' and no hotkey is associated with it.

Is there any built-in way to create a hotkey for a toolbar button?