Strange error "MenuItem does not contain a definition for CommandParameter"

I follow the example of ListView Context Actions
https://developer.xamarin.com/guides/xamarin-forms/user-interface/listview/interactivity/#Context_Actions

to use swip-to-delete feature

    <ListView x:Name="lvElectricianList" RowHeight="50" ItemTapped="lvElectricianList_ItemTapped">
        <ListView.ItemTemplate>
            <DataTemplate>
                <ViewCell>
                    <ViewCell.ContextActions>
                        <MenuItem CommandParameter="{Binding .}" Text="Delete" IsDestructive="True" Clicked="MenuItem_Clicked" />
                    </ViewCell.ContextActions>
                    <StackLayout Orientation="Horizontal">
                        <StackLayout Orientation="Vertical" HorizontalOptions="CenterAndExpand">
                            <Label Text="{Binding Name}" Font="20" FontAttributes="Bold" />
                            <StackLayout Orientation="Horizontal">
                                <Label Text="Nickname:" Font="14"  />
                                <Label Text="{Binding Nickname}" Font="14"/>
                            </StackLayout>
                        </StackLayout>
                        <Label Text="› " Font="30" FontAttributes="Bold" VerticalTextAlignment="Center" HorizontalOptions="End" TextColor="Green" />
                    </StackLayout>
                </ViewCell>
            </DataTemplate>
        </ListView.ItemTemplate>
    </ListView>

But the behind event code

    private void MenuItem_Clicked(object sender, EventArgs e)
    {
        MenuItem mi = (MenuItem)sender;
        Electrician selectedElectrician = ((Electrician)mi.CommandParameter);
        .......
    }

Visual Studio 2015 says the following error message:

Severity Code Description Project File Line Suppression State
Error CS1061 'MenuItem' does not contain a definition for 'CommandParameter' and no extension method 'CommandParameter' accepting a first argument of type 'MenuItem' could be found (are you missing a using directive or an assembly reference?)

According to Xamarin, Xamarin.Forms.MenuItem Class has CommandParameter as its public property

https://developer.xamarin.com/api/type/Xamarin.Forms.MenuItem/

But VS2015 can't recognize it and it can't be built. Please help to solve the problem. Thanks