How to create Jasper report custom input page with itempicker

[rgm1]

Has anyone tried to create a custom input page for a Jasper report with an itempicker?  I see that the ootb  ChangeSummary report uses one - I tried to copy the pattern where it uses a .js script to set the contextOid (of the selectedobject) as a hidden input (and verify it is set when I debug) and submits the form but it is not getting passed to the report task.xml.  

Thanks.

[VladimirN]

From "Help Center" - "Jasper Report Input Page Customization": https://support.ptc.com/help/windchill/r12.1.2.0/en/index.html#page/Windchill_Help_Center/customization/WCCG_BusLogicCust_ReportGeneration_ReportInputPageCust.html

[rgm1]

Thanks - I did see this but this does not include a picker.  I tried to modify by adding above the name

<wctags:itemPicker id="itemPicker" objectType="wt.part.WTPart" label="part picker" />

but when I click the search button the popup window is blank.  Am I missing something?  I am using this generic tag from the pickers help page.