#2749 Set hflex="min" to Groupbox fail

[jimmy shiau]

<zk>
<groupbox hflex="min" mold="3d">
<caption label="groupbox" />
<div width="100px" height="100px"
style="border:1px solid black;" />
</groupbox>
</zk>

[Jumper Chen]

Bug fixed since 2011/07/08.

Please specify hflex with min on Caption as well.