Why ComboBox in actinoscript 3 take so much space to show all its items?

<div style="background-color:blue">
<object height="300px" width="100px" type="application/x-shockwave-flash" data="/flash/cameralist.swf" id="cameralist" style="visibility: visible;"></object>
</div开发者_如何学JAVA>

It's taking up 300px ,but actually only the upside 150px is in use.

How to show all its items while keeping the page UI normal?

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It seems that it's just the specification of the component you are using, which has fixed dimensions. If you have access to its source code try to play with width, height (like setting them to 100% if this is Flex).