public override Property GetSubpropValue(Property baseProp, string subpropName)
{
LengthPair val = baseProp.GetLengthPair();
return val.GetComponent(subpropName);
}
protected override Property SetSubprop(Property baseProp, string subpropName, Property subProp)
{
LengthPair val = baseProp.GetLengthPair();
val.SetComponent(subpropName, subProp, false);
return baseProp;
}