Label does not get truncated in FormItem

[Frank Dahmen]

Hi,
in a mobile project i have:

<s:VGroup width="100%" paddingLeft="25" paddingRight="25">
  <s:Form>
      <s:FormItem label="label">
          <s:Label text="{longText}" />
     </s:FormItem>
 </s:Form>
</s:VGroup>

the Label is not truncated even if i set Form or ForrmItem to a small width 
like width="100"

it is also not clipped at the supposed width, like it has no bounds at all

what I'm doing wrong?

Thanks