How can I tell a ContextMenu to place itself relatively to its control and not the cursor? [duplicate]

Answer 1

Check out Remarks under ContextMenu.Placement

and try this

<Button Content="Do this" Height="23" Width="75" 
     ContextMenuService.Placement="Bottom"
     Command="local:MyCommands.ThisCommand">
    <Button.ContextMenu>
        <ContextMenu>
            <MenuItem Header="Do this" Command="local:MyCommands.ThisCommand" />
            <MenuItem Header="Do that" Command="local:MyCommands.ThatCommand" />
        </ContextMenu>
    </Button.ContextMenu>
</Button>