In my UserControl, I have one StackPanel (Name="Stack1") on Row 1 and one Grid (Name=gridMain) on Row 2. On Loading of my UserControl, I do this

            Infragistics.Controls.Interactions.XamDialogWindow helloWindow1 = new Infragistics.Controls.Interactions.XamDialogWindow() { Width = 350, Height = 300, StartupPosition = StartupPosition.Center, IsModal = true };
            helloWindow1.Content = "Hello";
            helloWindow1.ModalBackgroundEffect = new BlurEffect() { Radius = 10 };
            this.Stack1.Children.Add(helloWindow1);
            helloWindow1.WindowState = Infragistics.Controls.Interactions.WindowState.Normal;

 Infragistics.Controls.Interactions.XamDialogWindow helloWindow = new  Infragistics.Controls.Interactions.XamDialogWindow() { Width = 350, Height = 300, StartupPosition = StartupPosition.Center, IsModal = true };
            helloWindow.Content = "Hello";
            helloWindow.ModalBackground = new SolidColorBrush(Colors.Beige);
            helloWindow.ModalBackgroundEffect = new BlurEffect() { Radius = 10 };
            this.gridMain.Children.Add(helloWindow);
            helloWindow.WindowState = Infragistics.Controls.Interactions.WindowState.Normal;

I would have expected to have Row 1 and Row 2,  both have a popup window and the 2 rows's background being disabled.

BUT this is not the case, only Row 2's background is disabled. Row 1 is still enabled.

It is only when I close the pop up in Row 2, that Row 1's background is disable.

Is this a known issue?