How to make items visible but inaccessible in a dropdown

I have dropdown1 with items1-3.  I have dropdown2 with items 1-10.  When item1 is selected in dropdown1 I want dropdown2 to display all 10 items but some items be inaccessible(faded out) and not selectable.

(example)

item1  =    [dropdown2] item 1 = selectable

                [dropdown2] item 2 = selectable

                [dropdown2] item 3 = selectable

                [dropdown2] item 4 = not selectable

                [dropdown2] item 5 = selectable

                [dropdown2] item 6 = not selectable

and so on.

I have coded dropdown2 to populate based on items selected from dropdown1 but the problem is the user needs to see options that are not available for selection?

I am very new to FormCalc & Java any help would be greatly appreciated!!  I am using LiveCycle Designer ES 8.2