Change Panel button settings during maximize event will cause Panel not resize properly.

<zk>
  <zscript><![CDATA[
    void onMaximize() {
      if (panel.isMaximized()) {
        panel.setClosable(false);
      } else {
        panel.setClosable(true);
      }
    }
  ]]></zscript>
	<panel id="panel" title="Bug" border="normal" width="300px" height="200px" minimizable="true" collapsible="true" closable="true" maximizable="true" onMaximize="onMaximize()">
		<panelchildren></panelchildren>
	</panel>
</zk>