We don't write programs for people in this forum. If you need help with a specific piece of the code then provide the code you have and someone may be able to help you. What you're asking in this post is for someone to build this stuff out for you and that isn't going to happen. Please tell us specifically what you need help with (multiple questions if necessary) and provide us your existing code along with any errors or issues you're seeing.
simple login form in wpf

Login screen should show with user name , password and drop down with xml file names.
2. For time being dont validate credentials
3. User should select any xml file.
4. After selecting, application should launch with tree view with nodes from xml file on left side.
5. Main window should have menus and one dropdown for xml file selection.
6. first Menu: Layout (under this) show all layouts.
7. Use able to select any menu item. On selection it should show layout design right after the tree view.
8. User able to select any node from Tree view.
9. On selection of tree node, a popup window should shown with custom details "you have selected ....node".