Gets or sets whether an end user can edit task start and finish dates by moving tasks alongside the timeline. This is a dependency property.
true, if an end user can move tasks alongside the timeline; otherwise, false.
When the AllowTaskMove property is set to null, the ability to change the task start and finish dates depends on the AllowEditing property value.
The task duration is a working time duration. When an end user moves task, the task duration does not change, but the calendar duration (FinishDate - StartDate) may be different.