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setOnClickHandler

My code looks like this:
aToolBar.setOnClickHandler(doButtonClick);
function doButtonClick(itemId,itemValue)
{ alert(itemId); }

This does not seem to work. Instead I get this Javascript error:
Error: that.persAction is not a function
Source File: http://www.otshop.no/js/dhtmlxToolbar/codebase/dhtmlxprotobar.js
Line: 10

Please be sure that next command
    aToolBar.setOnClickHandler(doButtonClick);
was called before xml with configuration loaded ( or before buttons added by script )

>> Error: that.persAction is not a function
Such error can occurs if you are using
    menu.setItemAction
with non function parameter.