Ah! I see!
Well, you're going to create a Rule for your control, and put it into there.
Here is what my form looks like:
First: Select the controls that you want to manipulate:
Second: In the top Ribbon, add a new rule by clicking on the Add Rule button:
Third: The Rule Panel will open from the right side of your screen, and from there you will be able add the code that I have posted above into the Condition section of the Rule, and it will apply to all of those selected controls! Make sure that you also change the Rule Type to Formatting and check the Disable box near the bottom of the dialog. I have highlighted all of those fields in the image below.
I hope that this helps you on your way. If you need additional help, please ask.
Could you please mark my answer as the Solution to this problem so that others will be able to quickly see how to accomplish this as well?
Thank you, and I'm very happy that it worked for you!