In the code behind of the button click (from the Login) you can check the credentials and if the user passes it, you simple can navigate to your second window or attach it to the root.
you can disable using the property IsEnabled=false;
if you do that then you will not have access to all the controls in that window, apart from that you will have access only to the standard minimize,maximize,resize buttons if available on top right corner of the title. which is non client area.
Prasad - www.beautifulmind.blog.co.in Microsoft MVP
Proposé comme réponseprasad22MVPmercredi 1 juillet 2009 17:25