How to add a Tooltip to Menu in WPF

The MenuItem.ToolTip tag adds a tooltip to a menu item. The following code adds a tooltip to the Open menu item.

<MenuItem Header="_Open" IsCheckable="true">

    <MenuItem.ToolTip>

        <ToolTip>

             Open a file.

        </ToolTip>

    </MenuItem.ToolTip>

</MenuItem>