Places the mechatronic object mo on the placeholder with the name placeholderName in this mechatronic component.

addToPlaceholderObjects(MechatronicObject mo, String placeholderName)
Argument	MechatronicObject	mo	A mechatronic object to place.
	String	placeholderName	The name of the placeholder of the component.
Return value
Exception	Throws a PlaceholderNotExistingException, if no placeholder with the specified name exists.