"Hide Object When..." not working with simple calc

[Rich S]

Well, I thought this was a no-brainer...

I have a simple Count calculation field (number result, unstored) that works as it should, but I want to use a "Hide Object When..." text box--with an error message inside--to make the message appear when the count is zero.

The first calculation that came to mind to use in Hide Object's "window" was: RESUME_PARENT::Inclusion_test__lcn > 0

It works, but only if I flip to another record then back. Is there a tweak in the calc I can add so it will update without having to flip records?

TIA for your help!

Edited November 22, 2015 by WF7A
Update

[doughemi]

See if Daniele Raybaudi's solution to my problem also helps here.

[Rich S]

Great! Thanks!