查找并关闭WPF窗口的所有子窗口

Ok so I have a WPF application that has a WinForms project in it. My main project is the WPF one. My question is how do I find all of the widows that are children of my Main Window that is WPF?? These Windows can be either WinForm or WPF so i need a way to determine of which type the child is to successfully close said form and all of its potential children. Ok so I have a WPF application that has a WinFo