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Is it possible to change the value of a callBackElement from within a handler function?
function findname(e){ // this function is called by a handler triggered by a keypress on  a textBox
  var app = UiApp.getActiveApplication();
  var hiddenD = app.getElementById('hiddenD');
  var str = e.parameter.find ; // find is the textBox's name
  var found = point(str);// point() is a function that returns the rowindex of the found value
  hiddenD.setValue(found);// hiddenD is the hidden widget that I want to 'manipulate'
  nextitem(e);// nextitem is the function that updates the UI and that is normally called by a handler on another button
return app
}

searchHandlerFunction(e){
//Your all other sttements
//Assign the new value to hidden parameter
e.parameter.hidden = <your new value>;
DisplayFunction(e);
}