Bug in border layout with group box

<?page title="Method3"?>
<zk>
	<style>
 
	</style>
	<window border="none" width="100%" >
		<separator spacing="1px" />
		<groupbox width="92%" mold="3d" height="100%" style="padding-left: 10px;">
			<attribute name="onOpen"><![CDATA[
	arrow1.setSclass("open-" + self.isOpen());
]]></attribute>
			<caption label="Contacts">
				<div id="arrow1" class="open-true"></div>
			</caption>
			<vbox>
				<toolbarbutton id="Adjuster" label="Adjusters" />
				<toolbarbutton id="Attroneys" label="Attroneys" />
				<toolbarbutton id="CaseManager" label="CaseManager" />
				<toolbarbutton id="Employers" label="Employers" />
			</vbox>
		</groupbox>
		<separator spacing="20px" />
		<groupbox width="92%" mold="3d" height="100%" style="padding-left: 10px;">
			<attribute name="onOpen"><![CDATA[
	arrow2.setSclass("open-" + self.isOpen());
]]></attribute>
			<caption label="Claim Settings">
				<div id="arrow2" class="open-true"></div>
			</caption>
			<vbox>
				<toolbarbutton id="ClaimCustomFields"
					label="Claim Custom Fields" />
				<toolbarbutton id="Claimstatus" label="Claim Status" />
				<toolbarbutton id="InsFollowupStatus"
					label="Ins Followup status" />
				<toolbarbutton id="Modifiers" label="Modifiers" />
			</vbox>
		</groupbox>
		<separator spacing="20px" />
		<groupbox width="92%" mold="3d" height="100%" style="padding-left: 10px;">
			<attribute name="onOpen"><![CDATA[
	arrow.setSclass("open-" + self.isOpen());
]]></attribute>
			<caption label="Providers">
				<div id="arrow" class="open-true"></div>
			</caption>
			<vbox>
				<toolbarbutton id="PracticeProviders"
					label="Practice Providers" />
				<toolbarbutton id="ReferringProviders"
					label="Referring Providers" />
				<toolbarbutton id="PrimarycareProvider"
					label="Primary Care Providers" />
			</vbox>
		</groupbox>
	</window>
</zk>

<zk>
	<style>
	</style>
	<window border="none" width="100%" height="100%">
		<separator />
		<div left="20px"></div>
		<separator />
		<borderlayout>
			<north title="North Border" border="0" height="70px">
				<div id="Menu">
				</div>
			</north>
			<west title="West Border " size="20%" flex="true"
				splittable="true" collapsible="true">
				<div id="nav">
					<include src="Admin.zul" />
				</div>
			</west>
			<center title="Center" border="0">
				<div height="99%" id="Screen">
				</div>
			</center>
			<south title="south" height="70px">
				<div align="center"></div>
			</south>
		</borderlayout>
	</window>
</zk>