I create a XamDialogWindow in code, add its Content, and then add the dialog it to my LayoutRoot.Children. When the XamDialogWindow is closed, I use the WindowStateChanged event to remove the XamDialogWindow from my LayoutRoot.Children when the WindowState is hidden.

When I do this a second time (based on user input), two XamDialogWindows show up, even though the first one is no longer in my Layout.Root.Children.

I'm starting to guess there may be a single XamDialogWindow manager/controller working behind the scenes to defeat the behavior I'm looking for. 

I'd really like to have more than one modless XamDialogWindow at a time, and not have to reuse a single instance.

Thanks for any help.