How to prevent a user from entering characters into a number field

How do you prevent a user from entering characters like A or B into a field that is defined as a numeric field?
Please note that
- we use block validation (for other reasons)
- we are not able to convert these numeric fields to character fields
We want to avoid a user being hasseled with the FRM-40209 ... message.
This message is
- not very helpfull because it does not inform us what the problem field is
- not suppressable
Any hints ?

I went back to the drawing board on this one.
You are absolutely right : the message can be catched !
By writing an on-error trigger you can check for the error number. Sadly enough my first attempt on this used the on-message trigger which never fired hence my desperation.
Anyway, the on-error trigger in combination with :SYSTEM.CURRENT_ITEM or :SYSTEM.TRIGGER_ITEM enables me to display a more meaningfull message to my users.
Thanks for the hint.

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suggestion:
don't make the edit field editable right from the start.
rather attach a behaviour to the field/text-sprite like:
property mySprite, myMember
on beginsprite me
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-- this is the channel-number of the editbox
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end beginsprite
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would block any unwished key, while editing
on MyKeyhandler
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stopevent;
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*https://developer.mozilla.org/en-US/docs/Web/API/window.open

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Edited by: Lakshmipathi on Jan 31, 2012 6:55 PM
Thread Locked - Reason Cross Post

okie .... i will tell briefly what is the problem ....
Take a scenario wherein a user has logged into my application and he is performing a task which will put his user id and his employee id into the session. Then he opens another window by using either ctrl+n or through files->new window.
So now a new browser will open but the session will be same ..... in this newly opened browser, user performs some operation which will remove the user id and employee id from the session .... Now if he again comes back to the first window and tries to do some operation, then a null pointer exception will be thrown saying that the employee id is null .... because he has deleted that in the newly created browser ..... to avoid this situation what can we do ???? can you please help me in this regard ??? you got my problem right !!!

How to prevent a user from entering characters into a number field

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