Display field based on drop list selection

I have a created field that is a drop list of values.

On a form/panel I want to show an additional user field based on what value the user selects from the drop list.

Example Field has drop list

Discontinued

Replaced

If user selects Replaced

Show field New Number box next to Replaced

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Try this:
ReplacementNumber
visible when (InactivationReason.Replaced)

Try this:
ReplacementNumber
visible when (InactivationReason.Replaced)

I swear I tried that and it didn't work It works perfectly! Thank you