<Grid>
        <Grid.DataContext>
            <sys:String>Test</sys:String>
        </Grid.DataContext>
        <Button VerticalAlignment="Center" HorizontalAlignment="Center" Content="{Binding}">
            <Button.ContextMenu>
                <ContextMenu>
                    <MenuItem Header="{Binding}"/>
                </ContextMenu>
            </Button.ContextMenu>
        </Button>
    </Grid>