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Tip of the Day
Language: Visual Basic
Expertise: Intermediate
Aug 21, 1997



Application Security Testing: An Integral Part of DevOps

Using LostFocus Events with Command Button Properties

If you're using LostFocus events but would also like to set the Default or Cancel properties for command buttons, you'll run into a confusing situation. Those properties trigger the Click event when the user presses either Enter or Escape without ever transferring focus to the command button. To trigger the "missing" LostFocus, you need to explicitly transfer focus yourself, and then call DoEvents to resequence to a VB chain of events. (Don't be scared by the naysaying over DoEvents--it's extremely useful in this situation and can cause no ill effects!) Use code similar to this:
 Sub Command1_Click () 
If Not (ActiveControl Is Command1) Then 
'Focus was transfered elsewhere 
'by validation code 
Exit Sub 
'Proceed with Click event code 
End If 
End Sub 
Karl E.
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