Message freezes the UI application without using the pop-up messagebox - wpf

Question

We are working with WPF. And we have an application with multiple screens and a tree in the left.
In one of them, the user add, edit and delete an node in that tree.
So, We need to show the user a message when he press delete message, if he really wants to delete or not (Yes/Cancel) message, which it needs to freeze the whole application. Then the user is forced to decide.
In the same time, we don't want a pop-up message. We need something like Adorner.
Shows a gray background (which means the whole application has freezed) and we can host a border with a message inside it.
We need alternatives options for Adorner.

Answer 1

You may use something like this
<Window x:Class="WpfApplication5.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Window1" Height="300" Width="300">
<Grid>
<Border Name="msg" Background="#20A0A0A0" Visibility="Hidden">
<StackPanel Orientation="Horizontal" VerticalAlignment="Center" HorizontalAlignment="Center">
<Button Margin="10" Click="Button_Click_1">Yes</Button>
<Button Margin="10" Click="Button_Click_1">No</Button>
</StackPanel>
</Border>
<Border Name="main">
<StackPanel>
<TextBlock Text="tex"/>
<Button Click="Button_Click">Delete</Button>
<Button>Another button</Button>
</StackPanel>
</Border>
</Grid>
</Window>
private void Button_Click(object sender, RoutedEventArgs e)
{
msg.Visibility = System.Windows.Visibility.Visible;
main.IsEnabled = false;
}
private void Button_Click_1(object sender, RoutedEventArgs e)
{
msg.Visibility = System.Windows.Visibility.Hidden;
main.IsEnabled = true;
}