Ismouseover trigger doesn't work when using showdialog and borderless window

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XAML

WPF

trigger

I have two Window for an application. One of them is MainWindow and the other is for settings. SettingsWindow is opened by using ShowDialog and setting its Owner to MainWindow when settings button is clicked.

On the `SettingsWindow` I have a button at the very bottom of the window and it changes the color to red when `IsMouseOver` is True and blue for False. But it doesn't change when the cursor is over the MainWindow. The image is below to be clear. How can I fix this problem?

CASE: The cursor is out of SettingsWindow but it keeps the red color, no change.

What I have tried:

<Window x:Class="AltoSS.SettingsWindow"
            xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
            xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
            Title="SettingsWindow"
            Height="150"
            Width="360"
            WindowStyle="None"
            AllowsTransparency="True"
            WindowStartupLocation="CenterOwner">

      <!-- Other control codes-->
      <Button Grid.Row="2" Content="KAYDET" 
              FontSize="15"
              FontWeight="Bold"
              BorderBrush="Gray"
              BorderThickness="0,2,0,2">
        <Button.Style>
          <Style TargetType="Button">
            <Setter Property="Background" Value="Blue"/>
            <Setter Property="Template">
              <Setter.Value>
                <ControlTemplate TargetType="Button">
                  <Border removed="{TemplateBinding Background}">
                    <ContentPresenter HorizontalAlignment="Center"            VerticalAlignment="Center"/>
                  </Border>
                  <ControlTemplate.Triggers>
                    <Trigger Property="IsMouseOver" Value="True">
                      <Setter Property="Background" Value="Red"/>
                      <Setter Property="Foreground" Value="White"/>
                    </Trigger>
                  </ControlTemplate.Triggers>
                </ControlTemplate>
              </Setter.Value>
            </Setter>
          </Style>
        </Button.Style>
      </Button>
    </Window>

private void btnOpenSettings_Click(object sender, RoutedEventArgs e)
{
   SettingWindow sw = new SettingWindow();
   sw.WindowStartupLocation = System.Windows.WindowStartupLocation.CenterOwner;
   sw.Owner = this;
   sw.ShowDialog();
}