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Editorial Team
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Asked: 2026-05-14T14:05:45+00:00

In Flash Professional CS4, I get migration issue warnings when I use mouse/keyboard input

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In Flash Professional CS4, I get “migration issue” warnings when I use mouse/keyboard input handler names such as onMouseDown, onKeyUp, etc., even though I have added event listeners for them. These names are perfectly legal for functions, but since these were automatically fired in ActionScript 2.0, we are now (albeit sensibly) warned that their use is no longer automatic in AS3.

I understand the purpose of the warnings, but they aren’t useful for me. I want to suppress these warnings, but without suppressing any other warnings, which I generally do find useful.

E.g., when I use code like this:

/** @constructor */
public function MyClass() {
  addEventListener(MouseEvent.MOUSE_DOWN, onMouseDown);
}

protected function onMouseDown(e:MouseEvent):void {

I get an annoying warning like this:

Warning: 1090: Migration issue: The onMouseDown event handler is not triggered automatically by Flash Player at run time in ActionScript 3.0. You must first register this handler for the event using addEventListener ( 'mouseDown', callback_handler).

There are flex compiler (mxmlc) flags (and a Flash Pro setting) which can suppress actionscript warnings, or all warnings, but I don’t want that. That’s too general.

Ideally I could suppress a specific error/warning number (Warning #1090).

Edit: I’ve found more “advanced” compiler flags with mxmlc -help advanced, which look promising. Specifically, the following seem like likely candidates:
warn-deprecated-event-handler-error
warn-deprecated-function-error
warn-deprecated-property-error

How do I get Flash to use these?

Edit 2: I found a flex-info.xml style document in the Flash User Data dir.
[userdatafolder]/Adobe/Flash CS4/en/Configuration/ActionScript 3.0/FlexInfo.xml
However, this file contains a disappointing comment: <!-- Flash does not support most flex-config options. -->, and doesn’t seem to respond to my directives even after restarting flash.
This is getting sad.

Edit 3: Found an issue “Erroneous, annoying “Migration issue” warnings” on Adobe bug tracker. A fix is confirmed for the Flex SDK, but no mention of Flash…

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1 Answer

  1. Editorial Team

    You can if you edit EnabledWarnings.xml in $Flash/$LOCALE/Configuration/Actionscript 3.0/EnabledWarnings.xml, where $Flash is the path to Flash inside your Applications/Program Files folder and $LOCALE is your language.

    e.g.

    /Applications/Adobe Flash CS4/en/Configuration/ActionScript 3.0/EnabledWarnings.xml

    You will need to edit line 29, setting the enabled attribute to false for warning with id 1090:

    <warning id="1090" enabled="false"  label="kWarning_DepricatedEventHandlerError">EventHandler was not added as a listener.</warning>

    Quick sidenote:

    “Flash Builder (CS4)” is a confusing term. After Flex Builder 3, Flex Builder got renamed to Flash Builder, there is no Flash Builder CS4. The regular Flash IDE is known as Flash Professional/Flash Professional CS4, this was to avoid confusion between products with similar names: Flash Catalyst, Flash Builder(was Flex Builder), Flash Professional. Obviously it doesn’t always work that great 🙂

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