How Can I make IsFocused false when there MouseOver is True?

Question

This is my attach behavior for IsFocused. Can someone tell me? How can I make IsFocused false when there MouseOver is True for a WPF control?

 public static class FocusExtension  
    {  
        public static bool GetIsFocused(DependencyObject obj)  
        {  
            return (bool)obj.GetValue(IsFocusedProperty);  
        }  
  
        public static void SetIsFocused(DependencyObject obj, bool value)  
        {  
            obj.SetValue(IsFocusedProperty, value);  
        }  
  
        public static readonly DependencyProperty IsFocusedProperty =  
            DependencyProperty.RegisterAttached(  
                "IsFocused", typeof(bool), typeof(FocusExtension),  
                new UIPropertyMetadata(false, OnIsFocusedPropertyChanged));  
  
        private static void OnIsFocusedPropertyChanged(  
            DependencyObject d,  
            DependencyPropertyChangedEventArgs e)  
        {  
            var uie = (UIElement)d;  
            if ((bool)e.NewValue)  
            {  
  
                if (uie.IsMouseOver == false)   
                {  
                uie.Focus();      
                }  
  
                //uie.IsMouseOver  
              /*  uie.Focus();*/ // Don't care about false values.  
            }  
        }  
    }  

Answer 1

You could try to refer to the code below.

Xaml:

<Window.DataContext >  
        <local:ViewModel  />  
    </Window.DataContext>  
  
  <Grid>  
        <ComboBox local:FocusExtension.IsFocused="{Binding IsFocused}" ItemsSource="{Binding List}" Height="80" SelectedIndex=" 0">  
            <ComboBox.Style>  
                <Style TargetType="ComboBox">  
                    <Setter Property="Foreground" Value="Red" />  
                    <Style.Triggers>  
                        <Trigger Property="IsFocused" Value="True">  
                            <Setter Property="Foreground" Value="Green" />  
                        </Trigger>  
                    </Style.Triggers>  
                </Style>  
            </ComboBox.Style>  
        </ComboBox>  
  
    </Grid>  

Codebehind:

 public class ViewModel   
    {  
        public ObservableCollection<string> List{get;set;} = new ObservableCollection<string>();  
        public ViewModel()  
        {  
            List.Add( "user1" );  
            List.Add( "user2" );  
            List.Add( "user3" );  
            List.Add( "user4" );  
            
        }  
    }  

The result:

Update:

The complete code:

271287-comboboxforegroundtrigger.txt

The result：

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