Enabling and disabling buttons in actionscript

Question

in flex i love using the enabled option for buttons (so when the user has not yet selected something in a datagrid or if a variable in the app is not properly set the button will not be enabled and will be grayed out... but once the condition is true the button automatically becomes enabled) like this:
<mx:Button 
label="Save Changes" icon="@Embed(source='images/disk.png')" click="saveData();"enabled="
{firstID != 0 &amp;&amp; changesMade == true}"/>
i have a control bar that has buttons but if the user is an Admin they have additional buttons (which i created using actionscript in an initApp() function once the app initializes like this):
 if (adminList.indexOf(Application.application.parameters.emplid) != -1){ 
var but:Button = new Button();but.label =
"Delete Account";but.addEventListener(
"click",confirm);but.setStyle(
"icon", deleteIcon);  
this.toolbar.addChild(but);}
how can i code the enabled function that i use i mxml in actionscript in the code above?

Answer 1

oops i just realized i forgot the return type.
this is helpful when the button is first created and the app is first initialized... but i need this button to automatically become enabled if the user does something (like click on a datagrid) and automatically disabled when the user clicks off of the datagrid (or some action that would enable/disable the button).
public function loadAdmins(returnedEvent:ResultEvent):void {adminList = returnedEvent.result[0].DEPT_LIST;
if (adminList.indexOf(Application.application.parameters.emplid) != -1){ 
var delBtn:Button = new Button();delBtn.label =
"Delete Account";delBtn.addEventListener(
"click",confirm);delBtn.setStyle(
"icon", deleteIcon);delBtn.enabled=delBtnEnabled();
this.toolbar.addChild(delBtn);}
public function delBtnEnabled():Boolean{ 
var returnVal:Boolean; 
if (firstID != 0){returnVal =
true;}
else{returnVal =
false;}
return returnVal;}