In the following case: when the Panel is maximized at the first time. Panelchildren's width is incorrect.

Test case:
<div height="300px" style="border: 2px solid green">
<panel title="Panel 3" border="normal" maximizable="true" hflex="min" vflex="min">
<panelchildren hflex="min">Panel Content</panelchildren>
</panel>
</div>