AS3 CheckBox Wont Work

Hey all, basically i have an empty AS3 fla file with just the following code:

import fl.controls.CheckBox;

var cb1 = new CheckBox();
cb1.label = "Beets";
cb1.y = 10;
addChild(cb1);

But when i run it, i keep getting this error:

TypeError: Error #1009: Cannot access a property or method o开发者_如何学Pythonf a null object reference.
    at fl.controls::CheckBox/drawLayout()
    at fl.controls::LabelButton/draw()
    at fl.core::UIComponent/callLaterDispatcher()

What am i doing wrong? :S

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Hey all, basically i have an empty AS3 fla file with just the following code:

Did you add to your library a checkbox component?