Xamarin forms: How to set the VerticalOptions value of StackLayout from viewmodel?

I tried like below:

Created a new property named verticalOption:

private LayoutOptions verticalOption;

public LayoutOptions VerticalOption
{
    get => verticalOption;
    set
    {
        verticalOption = value;
        OnPropertyChanged(nameof(VerticalOption));
    }
}

Then set its value initially as FillAndExpand:

VerticalOption = LayoutOptions.FillAndExpand;

At one point I need its value as CenterAndExpand.

VerticalOption = LayoutOptions.CenterAndExpand;

Finally on XAML:

<StackLayout 
    Orientation="Vertical"
    HorizontalOptions="CenterAndExpand"
    VerticalOptions="{Binding VerticalOptio}">

But the CenterAndExpand value is not working. Always stack layout is on the top section, not coming to the center position. Is anything wrong with my implementation?