I wanted to protect the element for Item Number to prevent accidental change/delete.  So I am trying to set the element to be ReadOnly after it has been added.

Using this code if not in Add Mode:
Attribute(ItemNo, 28,"1")                  // Make Read Only
Attribute(ItemNo, 5, "2, 255, 255")            // Change Backfill color to Teal
Attribute(ItemNo, 4, "0,0,0")                  // Text Color BLACK
Attribute(ItemNo, 11, "Lucinda Console")      // Set font

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The colors change OK, and the ReadOnly portion works, but the text is always greyed out.  Initially I did not have the lines for Text Color or Font, but added them to try to fix it.  I have also set the default on the design for the element to be ReadOnly, Not greyed out.

What did I forget?

Thanks Ray.  Where is that in the documentation?  I was sure I had seen this somewhere a few years ago, but could not locate it.