ShowDialog() behind the parent window

Question

I am using ShowDialog() with WindowStyle = WindowStyle.SingleBorderWindow; to open a modal window in my WPF (MVVM) application, but it lets me navigate to parent window using the Windows taskbar (Windows 7).

I've found an answer here: WPF and ShowDialog() but it isn't suitable for me because I don't need an "always on top" tool window.

Thanks in advance

Answer 1

Try setting the Owner property of the dialog. That should work.

Window dialog = new Window();
dialog.Owner = mainWindow;
dialog.ShowDialog();

Edit: I had a similar problem using this with MVVM. You can solve this by using delegates.

public class MainWindowViewModel
{
    public delegate void ShowDialogDelegate(string message);
    public ShowDialogDelegate ShowDialogCallback;

    public void Action()
    {
        // here you want to show the dialog
        ShowDialogDelegate callback = ShowDialogCallback;
        if(callback != null)
        {
            callback("Message");
        }
    }
}

public class MainWindow
{
    public MainWindow()
    {
        // initialize the ViewModel
        MainWindowViewModel viewModel = new MainWindowViewModel();
        viewModel.ShowDialogCallback += ShowDialog;
        DataContext = viewModel;
    }

    private void ShowDialog(string message)
    {
        // show the dialog
    }
}