Can you halt mxml UI construction until you have external UI config data loaded?

If I have external (xml) config data that describes how the UI should be built, grabbing it from a file or a web service happens asynchronously. It loads late sometimes and sometimes not, as one would expect.
I'm thinking I need to control how and when UI construction takes place. Can I do this in mxml? Or should I be building the UI completely in ActionScript which would let me begin the construction after firing an event indicating config data has been loaded?
Thanks

Thanks for answering.
Let me restructure how I've asked this.
Let's say I have four main components in my app. And let's say I want to be able to configure in a database somewhere which users see which components.
Like...
User 1 sees all four.
User 2 sees components 1 and 3
User 3 sees components 2 and 4
User 4 sees only component 2.
etc.
Problem is, if I create the components in mxml, they all get created and displayed before my web service gets back with the display options.
What's the best practice for doing this?
Thanks

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2014-03-13 5:31 GMT+01:00 Joseph_McDonald <[email protected]>:
    Re: How can you hide a Continue button until all clickboxes are
clicked? created by Joseph_McDonald<http://forums.adobe.com/people/Joseph_McDonald>in *Advanced
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Can you halt mxml UI construction until you have external UI config data loaded?

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