How to alter a button's enabled state from a script?

Question

How do I enable a button's enabled state from a script?
The problem is, that I can't figure out how to reference that
button!!! Let's say I have this script:
pbPreviewTest.enabled() = lbTest.length >= 1;
OK... well how do I get my script to be able to access
pvPreviewTest and lbTest?
I got this mxml...
<mx:Button id="pbPreviewTest" label="Preview Test"
right="5" top="5" enabled="false"/>
and this also:
<mx:DataGrid id="lbTest" height="413" width="100%" y="31"
draggableColumns="false">
but it doesn't seem to work :(

Answer 1

This is my mxml, how do I access pbPreviewTest from the
application script?
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="
http://www.adobe.com/2006/mxml"
layout="absolute">
<mx:Panel layout="absolute" top="0" bottom="0" left="0"
right="0">
<mx:Script>...
</mx:Script>
<mx:TextInput x="6" y="5" width="162"/>
<mx:Button x="176" y="5" label="S" width="22"/>
<mx:Button x="202" y="5" label="B" width="22"/>
<mx:VDividedBox id="div1" x="0" y="35" height="100%"
width="100%">
<mx:HDividedBox width="100%" height="159">
<mx:DataGrid id="lbPaths"
initialize="lbPaths.dataProvider = acPaths" height="100%"
sortableColumns="false" draggableColumns="false">
<mx:columns>
<mx:DataGridColumn headerText="Path"
dataField="Name"/>
</mx:columns>
</mx:DataGrid>
<mx:DataGrid id="lbView" height="100%" width="176"
sortableColumns="false" draggableColumns="false">
<mx:columns>
<mx:DataGridColumn headerText="View"
dataField="col3"/>
</mx:columns>
</mx:DataGrid>
<mx:DataGrid id="lbQuestions" height="100%"
draggableColumns="false">
<mx:columns>
<mx:DataGridColumn headerText="Title"
dataField="col1"/>
<mx:DataGridColumn headerText="Questions"
dataField="col2"/>
<mx:DataGridColumn headerText="Level"
dataField="col3"/>
<mx:DataGridColumn headerText="Apparatus"
dataField="col3"/>
</mx:columns>
</mx:DataGrid>
</mx:HDividedBox>
<mx:Canvas id="cn1" width="100%" height="100%">
<mx:Text x="3" y="7" text="Questions in Test:"
width="209"/>
<mx:DataGrid id="lbTest" height="413" width="100%" y="31"
draggableColumns="false">
<mx:columns>
<mx:DataGridColumn headerText="No." dataField="col1"/>
<mx:DataGridColumn headerText="Title"
dataField="col2"/>
<mx:DataGridColumn headerText="Question"
dataField="col3"/>
<mx:DataGridColumn headerText="Level"
dataField="col4"/>
<mx:DataGridColumn headerText="Apparatus"
dataField="col5"/>
</mx:columns>
</mx:DataGrid>
<mx:Button id="pbPreviewTest" label="Preview Test"
right="5" top="5" enabled="false"/>
</mx:Canvas>
</mx:VDividedBox>
<mx:Button x="300" y="5" label="Add"/>
<mx:Button x="357" y="5" label="Remove"/>
<mx:Button label="Preview Question" enabled="false"
right="4" top="5"/>
</mx:Panel>
</mx:Application>