The Canvas arranges its child components to their desired size regarding to their minimum and maximum size. It is possible to add an CanvasConstraint while adding a component to a Canvas. This constraint is an encapsulation of values used in an absolute layout (top, left, right, bottom) like in CSS.
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There are several possibilities to create swc libraries or assets. You can use embed tags wihing as-classes to force the compiler to include assets directly into your physical swf or you can use the flash IDE to link your assets in the library and publish them afterwards or at least use the flex oem compiler to compile your assets from the console.
There is a catch with all of these possibilities (in my opinion). The flash IDE is not open source, I always forget the syntax of the embed tags and using the console is failure prone.
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An Vbox arranges its child components vertically according to their desired size. If the size is is declared in percentage values, it will set the components bounds percentaged to the space left filled by fixed size components.
NOTE: percentaged values of child components are just handled if the desired size of the VBox was set explicitly.
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