Is there a way to get a confirmation ask before close a RadWindow in Silverlight

[Michael]

I used PreviewClose event, but it seemd not to reach my demand.I also tried RadWindow.Confirm() method in PreviewClose event,but the RadWindow was already be hidden before i clicked OK or Cancl button .

[Pana]

Hi Michael,

This can be a little tricky but actually the PreviewClose is the right event. You can set Cancel=false to prevent the window from closing if the close is not initiated by a Confirm reply. Refer to the following code:
And in XAML:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using Telerik.Windows.Controls;

namespace RadMenu_StretchItems
{
    public partial class MainPage : UserControl
    {
        public MainPage()
        {
            InitializeComponent();
        }

        private RadWindow w;
        private bool closeOnReply = false;

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            if (w == null)
            {
                w = new RadWindow();
                w.Show();
                w.PreviewClosed += new EventHandler<WindowPreviewClosedEventArgs>(w_PreviewClosed);
            }
        }

        void w_PreviewClosed(object sender, WindowPreviewClosedEventArgs e)
        {
            if (!closeOnReply)
            {
                e.Cancel = true;
                RadWindow.Confirm("Are you sure you want to close the window?", new EventHandler<WindowClosedEventArgs>(ConfirmClosed));
            }
        }

        void ConfirmClosed(object sender, WindowClosedEventArgs e)
        {
            if (e.DialogResult == true)
            {
                closeOnReply = true;
                w.Close();
                w = null;
                closeOnReply = false;
            }
        }
    }
}

And in XAML:

<UserControl x:Class="RadMenu_StretchItems.MainPage"
        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:telerik="http://schemas.telerik.com/2008/xaml/presentation"
        mc:Ignorable="d"
        d:DesignHeight="300" d:DesignWidth="800">

    <Grid x:Name="LayoutRoot" Background="White">
        <Button HorizontalAlignment="Center" VerticalAlignment="Center" Content="Open Window!" Click="Button_Click" />
    </Grid>
</UserControl>

Kind regards,
Pana
the Telerik team