For example, I create a sprite and assign its parent
mySprite = display.newSprite( myParentGroup, myImageSheet, sequenceData )
And later, I may want to remove its parent by
myParentGroup:removeSelf()
Do I need to care if mySprite is playing?
Do I need to care if any children in myParentGroup is not in the middle of a transition.to()?
Anything I need to be care before I call :removeSelf() on myParentGroup?
