Update the tabview when select the row in datatable - jsf-2

Question

In the below code i can update the tabview when i select the row in datatable.but here is one small problem is the editor in one of my tab is disable when select a row and the downlod is not working in first time if u click second time it will work correctly
<p:dataTable id="dataCall" var="call" value="#{calllist.mediumCallsModel}"
selection="#{calllist.selectedCall}" scrollRows="20" scrollHeight="350"
scrollWidth="150" liveScroll="true" selectionMode="single" paginator="true" rows="5"
widgetVar="callsTable" paginatorPosition="bottom" paginatorTemplate="{CurrentPageReport} {FirstPageLink} {PreviousPageLink} {PageLinks} {NextPageLink} {LastPageLink} {RowsPerPageDropdown}" rowsPerPageTemplate="5,10,20,50">
<p:ajax event="rowSelect" listener="#{calllist.onRowSelect}" update=":MyListForm:showlist: :MyListForm:growl " />
<p:ajax event="rowUnselect" listener="#{calllist.onRowUnselect}" update=":MyListForm:growl"/>
<p:column headerText="Call ID">
<h:outputText value="#{call.callId}"/>
</p:column>
<p:column headerText="Created By">
<h:outputText value="#{call.createdBy}" />
</p:column>
<p:column headerText="Location">
<h:outputText value="#{call.location}" />
</p:column>
<p:column headerText="Status">
<h:outputText value="#{call.status}" />
</p:column>
<p:column headerText="Product">
<h:outputText value="#{call.product}" />
</p:column>
<p:column headerText="Module">
<h:outputText value="#{call.module}" />
</p:column>
<p:column headerText="Group Assigned">
<h:outputText value="#{call.groupAssigned}" />
</p:column>
<p:column headerText="Assigned to">
<h:outputText value="#{call.assignedTo}" />
</p:column>
<p:column headerText="Call creation">
<h:outputText value="#{call.callCreation}" />
</p:column>
</p:dataTable>
<h:panelGrid >
<p:tabView id="showlist" cache="true" style="font-size: 15px; height: 260px;width: 995px">
<p:tab id="tab1" title="Call Details">
<p:fieldset id="calldetails" style="background-color: lightgray; font-weight: bold;color: black;">
<table border="0" width="900px" align="left" style="font-size: 12px">
<tr>
<td width="100px"><h:outputText value="Status:"/></td>
<td width="80px"><p:selectOneMenu id="status" value="#{calllist.selectedCall.statusId}" style="width:114px; font-size: 12px">
<f:selectItem itemLabel="Select Status" itemValue="-1" />
<f:selectItems value="#{calllist.dyStatusList}" />
</p:selectOneMenu> </td>
</tr>
</table>
</p:fieldset>
</p:tab>
<p:tab title="Work log/Comments">
<table id="comment_table" width="900px" height="200px" border="0" style="font-size: 12px;">
<tr valign="top">
<td>
<div id="oldcomment" style="width:450px; height: 90px; background-color:lightgray;font-weight: bold;color: black;overflow: scroll;">
<ui:repeat value="#{calllist.oldComments}" var="item">
<table>
<tr>
<td><h:outputText value="User ID"/></td>
<td><h:outputText value="#{item.modifiedUserID}"/></td>
</tr>
</table>
<hr/>
</ui:repeat>
</div>
<div id="comment" style="width:450px; height: 90px; background-color:lightgray; font-weight: bold;color: black;" >
</div>
</td>
<td>
<p:editor id="editor" width="400" height="190" onchange="append_comment();" value="#{calllist.comments}"/>
</td>
</tr>
</table>
</p:tab>
<p:tab title="Attachments">
<h:form id="download_form">
<table id="download_list">
<tr>
<td>
<p:fileUpload id="upload" fileUploadListener="#{calllist.handleFileUpload}" mode="advanced" sizeLimit="100000" multiple="true" allowTypes="/(\.|\/)(gif|jpe?g|png|xls)$/" />
</td>
<td>
<p:selectOneListbox id="scroll" value="#{calllist.fileName}" style="width: 250px;">
<f:selectItem itemLabel="Select" itemValue="-1"/>
<f:selectItems value="#{calllist.attachment}"/>
</p:selectOneListbox>
</td>
</tr>
<tr>
<td></td>
<td align="center">
<p:commandButton id="downloadLink" value="Download" ajax="false" icon="ui-icon-arrowthick-1-s">
<p:fileDownload value="#{calllist.file}"/>
</p:commandButton>
</td>
</tr>
</table>
</h:form>
</p:tab>