How to close parent window from user control in WPF?

This is a WPF application:

I have to implement a user control, in which there are two buttons, "Add" and "Cancel".
The Add button has to open a new window, and load another user control to that window.
The Cancel button has to close this window.
The current window only load this single user control .

How do we achieve that?
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chuang4630Asked:
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SAMIR BHOGAYTAFreelancer and IT ConsultantCommented:
hi.. try this code it is working

In user control 'login' button add this:
 
Window parentWindow = Window.GetWindow(this);
parentWindow.Close();
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chuang4630Author Commented:
It works. Thanks
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