Update released.

Meaningful when using the DTPicker control.
The Change event was only raised when changing the value by the user.
This behavior is the same in the original MS DTPicker control.
But that behavior makes actually no sense and might be even a bug in the original MS DTPicker control.
On all the other controls the Click/Change (or whatever) events are also raised when changing by code.
So such a behavior is expected and that's why this fix was necessary in my opinion.