Sorry to answer a question with a question, but what do you mean by "invisible" content?
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Don't worry You can use the below work around to print all the contents of the Container including the invisible contents under scrolll with out scroll bar..
So what the idea here is we are seeting the container height to full size with out scrolls before sending the container object to printer and as soon as you print the object you are restoring it to the original height with scrolls...so that you can print the full contents without scrolls...
You may have doubt that by chnaging and restoring the size the user may see momentary resize of the container but it is not so as it is a fraction of a second and user cannot notice this change... Give it a try ..I had already run into this problem recently and I have found a work around for this which is as below:
// Here mainContainer is the container or box id the contents of which you want to print
private function doPrintContainer():void
var printJob:FlexPrintJob = new FlexPrintJob();
if(printJob.start() != true) return;
var mainContainerHeight:int = mainContainer.height;
//Increasing the height of the desired component to be printed.
mainContainer.height = mainContainer.measuredMinHeight;
mainContainer.verticalScrollPolicy = "off";
//Adding the resized Component to our FlexPrintjob and then sending the print request
//Resizing the component back to normal size
mainContainer.height = mainContainerHeight;
mainContainer.verticalScrollPolicy = "auto";
trace("Error : " + error.message);
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