Solution to the length of flex4 and Flex3 combox drop-down box

stay mx:combbox in Use rowCount Property to control the height of the drop-down box

stay s:combbox in

<s:ComboBox id = "startPage"
    width="70"
        dataProvider = "{_model.resExportStartEndPage}"
    labelField="label"
        selectedIndex = "0"
        change = "onStartPageChange(event)">
    <s:open>
        <![CDATA[
            (startPage.scroller.getChildAt(0) as ScrollerSkin).verticalScrollBar.thumb.minHeight = 20;
        ]]>
    </s:open>
</s:ComboBox>

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