this will be a hard question unless you give more information about you layout, are you displaying this login as a popup, or just embed it to your application page. what's your layout options(absolute, vertical, horizontal, constrained layout...etc)
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what about removing horizontalCenter="0" verticalCenter="0" in your Application tag, you don't need them there. and further more you can modularize you component, make a login component then import it in your main page, so that you can reuse the loing component everywhere you want to use it.
Do you know why this cup is useful? Because it is empty.
horizontalAlign center move the login control from topmost left to topmost middle and verticalAlign will move it from topmost middle to center of the page (i.e., at the pink box)
nice you got it, but if use flex builder or plugin for eclipse, you should be able to modify the container properties via Property panel, it's a WYSIWYG editor.
Do you know why this cup is useful? Because it is empty.