I use Visual Studio Express 2012 for Windows Phone. When an error occurs during run time, I look in the Call stack window, but there are onlu systems functions there, and the last one, where the program stopped :
File : App.xaml.cs
Function : Application_UnhandledException
The function where the error really happened can never be found there. Is there an option to check to make this window display (if possible, only) usefull information ? Or is there another windows that should be used instead ?
Use the Exceptions dialog, set the debugger to Break on User-Unhandled Exceptions.
In Visual Studio's menu, Open Debug -> select Exceptions... -> check the first Checkbox for the Command Language Runtime Exceptions.
Edit: just notice that you are using Express version of 2012. As per the link,