Pop up alert on incompatible selections

[#1]

Hi guys,

I want to create a pop up Windows depending on some conditions.

I explain: I have two list boxes listA and listB.

listA         listB

1              A

2              B

2              C

4              D

5              E

6              F

7              G

8             H

9             I

10           J

for example when a user selects "1" in listA the possible values in listB are A,B,C.

What I want to do is to create a pop up warning when a user wants to select values D or E (or other incompatible values in listB)  in listB (assuming that "1" is always selected in listA)

How can I do ?

[tresesco]

Ideally users should be taught about the significance of the qv colors. If always one selected value is enabled, users won't able to select a greyed value from other listbox. If you want to remove this confusion(if you feel so), you can hide the excluded/greyed values from the listbox. Listbox->General tab->Hide excluded. Or, using listbox expression like:

Aggr(FieldB,FieldB)

[#3]

thanks for your reply.

I alreadry knew this feature. I wanted to do something different. Do you have an idea  on how I can achieve that goal ?