internal class PriorityButtonVisibilityConverter : IMultiValueConverter
    {
        public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
        {
            if (values is null ||
                values.Length != 4 ||
                !(bool)values[0] ||                                 //IsSelected
                !(values[2] is ReferenceModel reference) ||         //DataContext
                reference.IsBuiltIn ||
                !(parameter is string direction))

<Style TargetType="{x:Type Button}">
	<Setter Property="Visibility" Value="Collapsed"/>
	<Style.Triggers>
		<DataTrigger Value="True">
			<DataTrigger.Binding>
				<MultiBinding Converter="{StaticResource PriorityButtonVisibility}" ConverterParameter="Up">
					<MultiBinding.Bindings>
						<Binding RelativeSource="{RelativeSource FindAncestor, AncestorType={x:Type ListBoxItem}}" Path="IsSelected" />
						<Binding ElementName="ProjectSelect" Path="Items.Count"/>
						<Binding RelativeSource="{RelativeSource FindAncestor, AncestorType={x:Type ListBoxItem}}" Path="DataContext"/>

Public Function Objective(sv As Variant, y As Variant, x As Variant) As Variant

    sum1 = 0
    sum2 = 0
    For i = 1 To 15
        For j = 1 To 15

            sum2 = sum2 + sv(i) * sv(j) * y(i) * y(j) * (x(i, 1) * x(j, 1) + x(i, 2) * x(j, 2) + x(i, 3) * x(j, 3))

        Next j
        sum1 = sum1 + sv(i)
    Next i

    Objective = sum1 - 0.5 * sum2

End Function

        public virtual bool IsObject
        {
            get
            {
                if (AsTypeName == Tokens.Object ||
                    (AsTypeDeclaration?.DeclarationType.HasFlag(DeclarationType.ClassModule) ?? false))
                {
                    return true;
                }

                var notObject = AsTypeIsBaseType
                                || IsArray
                                || (AsTypeDeclaration?.DeclarationType.HasFlag(DeclarationType.UserDefinedType) ?? false)

If settings.runMethodA Then
  MethodA
End If

Public Sub MethodA
  If settings.runMethodA Then
    'do stuff
  End If
End Sub

PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));