form button enable problem in AX2009

I'm new to AX2009, and I have a small task in which we want a form button

enabled or disabled depending upon a user's security.

I created a user group called BTN_BomPrd, and put some code in the ProdTable(enableButtons)

form method which checks to see if the user has that security, and then enables or disables

the BOM button based on if the BTN_BomPrd entry is found in UserGroupList.

This works perfectly for me. If I give myself BTN_BomPrd, I get the button .If I take it

away from myself, it's gone,

The problem is with others. The button (buttonBOM) will disappear, but then will not come back

even when in debug/breakpoint I can see the code executing fine. I can give them security or

take it away, but the button remains invisible.

Is there some form refresh technique I'm missing?

Thanks!

K

------------------------------------------------------------------------code below

void enableButtons()

{

UserGrouplist UserGroupList;

;

select firstOnly UserGroupList

  where UserGroupList.userId == curuserid()

  && UserGroupList.groupId   == 'BTN_BomPrd';  

if (UserGroupList.RecId != 0)

{

    buttonBOM.Visible(true);

   buttonBOM.enabled(prodTable.ItemId      && prodTable.bomId      ? true : false);

}

else

{

  buttonBOM.Visible(false);

}

  buttonRoute.enabled(prodTable.ItemId    && prodTable.RouteId    ? true : false);

}