How to create a WPF Modal Window with a Scrollbars

Question

@FabricPam I tried setting the ScrollViewer and StackPanel to the same height, that failed to make a difference. I tried compiling in 4.8 (vs 4.0) that also failed to make a difference. I'm open to other workarounds as well because this issue seems systemic. My intent is to show a Modal Window when an exception is raised, pausing the main thread in the application until the Modal Window exits.

Answer 1

Let me look into it. @Anonymous

Answer 2

I show an example below. If I misunderstood, please let me know.
ModalWindow.xaml:

<Window x:Class="SaveFileFromMultipleTabItems.Window1"  
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"  
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"  
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"  
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"  
        xmlns:local="clr-namespace:SaveFileFromMultipleTabItems"  
        mc:Ignorable="d"  WindowStartupLocation="CenterScreen"  
        Title="Window1" Height="250" Width="400">  
    <ScrollViewer>  
        <StackPanel>  
            <Button Click="Button_Click" Content="click"/>  
            <Button Click="Button_Click" Content="click"/>  
            <Button Click="Button_Click" Content="click"/>  
            <Button Click="Button_Click" Content="click"/>  
            <Button Click="Button_Click" Content="click"/>  
            <Button Click="Button_Click" Content="click"/>  
            <TextBox Width="200" Height="50" Text="hello" TextWrapping="Wrap" FontSize="40"/>  
            <TextBox Width="200" Height="50" Text="hello" TextWrapping="Wrap" FontSize="40"/>  
            <TextBox Width="200" Height="50" Text="hello" TextWrapping="Wrap" FontSize="40"/>  
        </StackPanel>  
    </ScrollViewer>  
</Window>  

Modal.xmal.cs:

 public partial class Window1 : Window  
  {  
    public Window1()  
    {  
      InitializeComponent();  
    }  
    private void Button_Click(object sender, RoutedEventArgs e)  
    {  
      MessageBox.Show("hello");  
    }  
  }  

MainWindow.xaml:

 <StackPanel >  
            <Button Content="open modal window" Height="40" Click="Button_Click"/>  
            <Button Content="click" Height="40" Click="Button_Click_1"/>  
        </StackPanel>  

MainWindow.xaml.cs:

public partial class MainWindow : Window  
  {  
    public MainWindow()  
    {  
      InitializeComponent();  
    }  
    private void Button_Click(object sender, RoutedEventArgs e)  
    {  
      Window1 window = new Window1();  
      window.ShowDialog();  
    }  
    private void Button_Click_1(object sender, RoutedEventArgs e)  
    {  
      MessageBox.Show("hello");  
    }  
  }  

The result:

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