Checkboxes occasionally show this behavior. From a previous thread:

*  Event: chkBaseRefreshOK.Valid()
*  When SET CONFIRM is ON, the native checkbox control doesn't change its 
*  visible state in response to a mouse click or space bar press until the 
*  user exits the control, for example with the TAB key. This code fixes 
*  that behavior.

with this
   .value = EVALUATE(.ControlSource)
   NODEFAULT
endwith

HTH
Barbara


>Hi!
>Does anybody know why checkbox control is not working properly.
>Sometimes all is OK but many times when user is clicking on it, it seems than control is inactive, after several cliks it changes value. Sometimes it change value but it is not refreshed when focus is on it - when user moves to another control it is refreshed and showed properly.