Completed basic timer functionality.
Added Silverlight relay command implementation.
Timer function is now almost fully functional.
Added TextBlock showing remaining time (with decent drop shadow). Added command to Start/Stop button, and changed the name of the string to which its content is bound from StartOrStop to StartOrStopString. (The ViewModel method that actually starts or stops operation is now called StartOrStop.)
Bringing auto-generated files up to date.
Added Visibility property SecondsRemainingVisible, so that the seconds counter is only visible when the program has been started.
Forgot to add NotifyPropertyChanged for SecondsRemainingVisible.
Added binding for counter visibility.
Added 5 pixel Margin to LayoutRoot grid. I think this makes it look hella fancier.