ItemFocusOut called twice when you are using datagrid

Question

Have you ever encountered itemFocusOut called twice when you
are using datagrid. I use this event to check the text that has
been entered.
Also when I use regex expressions
if((event.itemRenderer as TextInput).text.search(new
RegExp(/.*\..*\./)) != -1){
in the itemFocusOut method and someone enters
234.34.234
I get an error
TypeError: Error #1009: Cannot access a property or method of
a null object reference.
at
mx.controls::DataGrid/destroyItemEditor()[C:\autobuild\3.2.0\frameworks\projects\framewor k\src\mx\controls\DataGrid.as:4000]
at
mx.controls::DataGrid/itemEditorItemEditEndHandler()[C:\autobuild\3.2.0\frameworks\projec ts\framework\src\mx\controls\DataGrid.as:4897]
at flash.events::EventDispatcher/dispatchEventFunction()
at flash.events::EventDispatcher/dispatchEvent()
at
mx.core::UIComponent/dispatchEvent()[C:\autobuild\3.2.0\frameworks\projects\framework\src \mx\core\UIComponent.as:9298]
at
mx.controls::DataGrid/endEdit()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\c ontrols\DataGrid.as:4041]
at
mx.controls::DataGrid/mouseDownHandler()[C:\autobuild\3.2.0\frameworks\projects\framework \src\mx\controls\DataGrid.as:4296]
Could some be so kind as shed some light on this
situation

Answer 1

I've worked around the error. I had something to do with the
fact that the event was being twice and I worked my handling code
around to avoid the error. However the problem with the event still
remains. I think it is because the data it in the grid is being
refreshed intentially after the code in the itemFocusOut is called
that is cause the second event to fire.