Places the mechatronic object mo on the placeholder placeholder on the index index in this mechatronic component.

addToPlaceholderObjects(MechatronicObject mo, Placeholder placeholder, int index)
Argument	MechatronicObject	mo	A mechatronic object to place.
	Placeholder	placeholder	A placeholder of the component.
	Integer	index	A valid index within the already existing objects on the placeholder
Return value
Exceptions	Throws an IndexOutOfBoundsException if the specified index is out of bounds: -1 < index < getPlaceholderObjects(placeholder).size()