Specifies how a timeline behaves when it is outside its active period but its parent is inside its active or hold period.
<object property="EnumerationValue" .../>
value = "EnumerationValue"
|HoldEnd||After it reaches the end of its active period, the timeline holds its progress until the end of its parent's active and hold periods.|
|Stop||The timeline stops if it is outside its active period while its parent is inside its active period.|