RadTransitionControl with PRISM

[amine]

Hi,

I try to use RadTransitionControl with PRISM, but my program does not work correctly.

Xaml :

<telerik:RadTransitionControl prism:RegionManager.RegionName="MyRegion1" >
    <telerik:RadTransitionControl.Transition>
        <telerik:FadeTransition/>
    </telerik:RadTransitionControl.Transition>
</telerik:RadTransitionControl>

CB :

private void RadMenu_ItemClick(object sender, Telerik.Windows.RadRoutedEventArgs e)
        {
            switch ((e.OriginalSource as ExtendedMenuItem).AdditionalInfo.ToString())
            {
                case "XX":
                    _moduleManager.LoadModule("XXImpl");
                    break;
                case "YY":
                    _moduleManager.LoadModule("YYImpl");
                    break;
                case "ZZ":
                    _moduleManager.LoadModule("ZZImpl");
                    break;
                default:
                    MessageBox.Show("Module indisponible");
                    break;
            }
        }

my problem is that the transition does not work. There is only the first module that appears.
how I can solve this problem.
thank you