Normal When I load a zul file that creates a panel with open="false", the panel does not display when that panel has hflex="min".
Here is a code snippet that shows the issue. You can run it in the sandbox.
<zk> <vlayout spacing="1em"> <span>Using firefox 20 and IE 10. </span> <span style="color:red">Attributes: hflex=min, open=false</span> <div style="border:dashed red 1px"> <panel hflex="min" open="false" title="Panel" border="normal" collapsible="true" > <panelchildren> This is your data. Why does this disappear when this is collapsed? Clicking the collapse button works as expected. </panelchildren> </panel> </div> Attributes: hflex=min, open=true <panel hflex="min" open="true" title="Panel" border="normal" collapsible="true" > <panelchildren> This is your data. Why does this disappear when this is collapsed? Clicking the collapse button works as expected. </panelchildren> </panel> Attributes: width=200px, open=false <panel width="200px" open="false" title="Panel" border="normal" collapsible="true" > <panelchildren> This is your data. Why does this disappear when this is collapsed? Clicking the collapse button works as expected. </panelchildren> </panel> </vlayout> </zk>