Type: System.Nullable<Double> null if this clock is Stopped, or 0.0 if this clock is active and its Timeline has a Duration of Forever; otherwise, a value between 0.0 and 1.0 that indicates the current progress of this Clock within its current iteration. A value of 0.0 indicates no progress, and a value of 1.0 indicates that the clock is at the end of its current iteration.
A clock that is Filling has a CurrentProgress of 1.0.
Using a Timeline as a Timer
A timeline's clock will only progress when there's an event hander associated with it or (in the case of an AnimationClock object) it is associated with a property. For this reason (and others), it's not recommended that you use a Timeline as a timer.
Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)