If you have to rely upon it a lot, you best investigate the event system a bit more or look at frameworks like Robotlegs or Mate. However, for a quick one-off, you can use FlexGlolbals.topLevelApplication.myVariable just about anywhere, if the main class has that variable publicly defined.

Here's my amazing app:

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
                                 xmlns:s="library://ns.adobe.com/flex/spark"
                                 xmlns:mx="library://ns.adobe.com/flex/mx"
                                 xmlns:ns1="*"
                                 width="300" height="300" minWidth="300" minHeight="300" creationComplete="init()">
          <s:layout>
                    <s:BasicLayout/>
          </s:layout>
          <fx:Script>
                    <![CDATA[
  
                              public var myVariable:String;
  
                              private function init():void{
                                        myVariable = "Hello World";
                              }
                    ]]>
          </fx:Script>
          <ns1:myComponent horizontalCenter="0" verticalCenter="-31">
          </ns1:myComponent>
</s:Application>

and my equally cool component

<?xml version="1.0" encoding="utf-8"?>

<s:Group xmlns:fx="http://ns.adobe.com/mxml/2009"

                     xmlns:s="library://ns.adobe.com/flex/spark"

                     xmlns:mx="library://ns.adobe.com/flex/mx">

          <fx:Script>

                    <![CDATA[

                              import mx.controls.Alert;

                              import mx.core.FlexGlobals;

                    ]]>

          </fx:Script>

          <fx:Declarations>

                    <!-- Place non-visual elements (e.g., services, value objects) here -->

          </fx:Declarations>

          <s:Button x="0" y="0" label="Say Hello" click="{Alert.show(FlexGlobals.topLevelApplication.myVariable)}"/>

</s:Group>

 

Bt it can't work.

get the error as property textIP not found and there is no default value.