Here is an example of what I think you want to do.
Here is how you do it. Go to the block diagram and right click on the graph/ select create then property node/ then once the property node is on the block diagram then you will left click on it and then select yscale/name label/text then you wire a control to the property node. I hope this is the info you are looking for.
Joe
Joe.
"NOTHING IS EVER EASY"