Using Event handler or something similar - button

Question

I'm working on Adobe Flash CS5 and on actionscript 3 - My question is how can I make a button that only becomes available to click on once the four other buttons have been clicked and the scenes have been accessed?

Answer 1

Let's assume that your 5 buttons are always available on the timeline and they are at the top document level (if not, we need to make some adjustments). Let's also assume that, from your question, you're not ready for the best practice of a document Class file, so this will be written as timeline script.
//assumes the 4 buttons are on the stage, named button1, button2, etc.
var prerequisiteButtons:Array = [button1, button2, button3, button4];
var prerequisitesClicked:Array /*of Boolean*/ = [];
coyButton.enabled = false;//your fifth button, who plays hard to get
//loop through and listen for clicks on your prerequisite buttons
for each (var button:DisplayObject in buttons) {
button.addEventListener(MouseEvent.CLICK, checkAllClicked);
}
//check to see if all the buttons have been clicked
function checkAllClicked(e:Event):void {
//find the button in the prerequisite buttons array
var buttonIndex:int = prerequisiteButtons.indexOf(e.currentTarget);
//set the matching index to true in the array that keeps track of what has been clicked
prerequisitesClicked[buttonIndex] = true;
//count how many of them have been clicked
var prerequisiteDoneCount:int = 0;
for (var i:int = 0; i< prerequisitesClicked.length; i++) {
if (prerequisitesClicked[i]) prerequisiteDoneCount++;
}
//if all the buttons have been clicked, enable the button (may also want to add a listener here)
if (prerequisiteDoneCount==prerequisiteButtons.length) coyButton.enabled = true;
}