C# WPF ComboBox Mouse over color

Question

When the mouse hover over my ComboBox, I get an awful blue/lightblue pair of color for the backgroung of my ComboBox. I tried the solutions here :ComboBox Mouse over color,

Answer 1

There it no item in my ComboBox in the test project. I just hover the mouse over it and the whole control is blue. Here is the .cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WpfApplication1
{
    /// 

    /// Logique d'interaction pour MainWindow.xaml
    /// 
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }
    }
}

Here is the xaml :