Problems with popup lov in report in Apex 4.0.2.00.08 XE 11g is a bug?

I had a report in Apex 3.2 in XE 10g. The type of field was popup lov(editable)
i defined a trigger on change to load data from database and fill anothers fields.
to know in wich row change this field i have the nex javascript code
var vRow = pThis.id.substr(pThis.id.indexOf('_')+1);
in this release works fine and return 1 (0001) for the first rows, etc etc
in the new version 4.0.2.00.08 in XE 11g the same code return 0000, but if i put a trigger in a field(column)(editable too) of the same row returns 0001, Is this a bug? or in apex 4 change the ordinal of rows for popup lovs only?
thanks
The current version of apex is 4.0.2.00.08 XE 11g (the release included with the database ) and runs in Windows Vista and internet explorer 8
Edited by: DanielB on Jun 13, 2011 11:52 AM
Edited by: DanielB on Jun 13, 2011 11:57 AM

when i put the mouse over the popup lov in release 3.2 , on the console bar i can see javascript:genList0_f01_0() for the first record and javascript:genList0_f01_1() for the second
in release 4 and 4.1 javascript:genList0_f01_$_row() for the first record and javascript:genList0_f01_1() for the second, i think this is my problem......

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Hi Jan,
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onBlur="javascript:f_P21_select_kostenposten(this,'P21_KOSTENPOST');"on P21_GBREKNR. This is getting attached to the HTML input text field but as well the the anchor link which opens the popup. So when you leave the text field the cursor will be put onto the icon to open the Popup LOV. When you press tab another time or leave the anchor link by clicking somewhere the above JavaScript function is fired again. But the problem is that "this" this time points to the anchor and not the text item anymore, so it will return an invalid value when you access this.value in your f_P21_select_kostenposten function which results in an empty result of your on-demand call.
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