I\'m setting up a program that has three different windows. I\'m just using ..
Window1 win1 = new Window1(); win1.show();
...for each of the extra windows.
Set the ShowInTaskbar to false
<Window ShowInTaskbar="False" ... />
If you want to make the windows related together, like when you click one of them it brings them all, set the Owner before showing the window (assuming this
is your main window)
Window1 w = new Window1();
w.Owner = this;
Set the "secondary" windows' ShowInTaskbar property to false. Also it wouldn't hurt to set their Owner property to App.Current.MainWindow, so that the all the windows close (and hence the application exits) when the main window is closed.