Change border color based on boolean

I have a wihch border. I want to change its color depending on a boolean variable. I used the link here to implement the converter Boolean

to Color

.

The code looks like this:

xaml:

<Border Width="45" 
     Height="45" CornerRadius="5" 
     Background="{Binding Path=LivenessActive, Converter={StaticResource BrushColorConverter}}" />

      

        
        
        
      

    

Variable LivenessActive in the background:

public bool LivenessActive
{
  get { return _livenessActive; }
  set
  {
      _livenessActive = value;
      OnPropertyChanged("LivenessActive");
  }
}

      

        
        
        
      

    

If the class has inheritance for INotifyPropertyChanged

and has implemented an event OnPropertyChanged

.

BrushColorConverter.cs:

public class BrushColorConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        if ((bool)value)
        {
            {
                return new SolidColorBrush(Colors.GreenYellow);
            }
        }
        return new SolidColorBrush(Colors.DarkGray);
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }

}

      

        
        
        
      

    

But I can't even run BrushColorConverter

. What am I doing wrong?

2nd: What if I want to use it from another window?

<Border Width="45" Height="45" CornerRadius="5" 
     Background="{Binding Path=LivenessActive, Converter={StaticResource BrushColorConverter}, 
                RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type view:MyWindowName}}}" />

      

        
        
        
      

    

I used this same code and couldn't find it.