Here a sample :
<ext:Window runat="server" Width="600" Height="400" CloseAction="Destroy">
<Items>
<ext:Panel runat="server" Border="false" Width="230" BodyStyle="background-color: transparent">
<Content>
<div style="border: 1px solid #B5B8C8">
<legend class="x-fieldset-header x-fieldset-header-default">
<div class="x-component x-fieldset-header-text x-component-default">Resume</div>
<div class="x-clear" role="presentation"></div>
</legend>
<div id="pnlResume" onmouseover="this.className='editable-over';" onmouseout="this.className='editable';" class="editable" style="height: 144px; min-height: 32px; max-height: 144px; overflow-y: auto"></div>
<ext:Editor ID="edtResume" runat="server" Alignment="tl-tl?" Shadow="false" Width="228" UseHtml="true" CancelOnBlur="true" CompleteOnEnter="true" Cls="editable-background" Target="pnlResume">
<Field>
<ext:TextArea ID="edResume" runat="server" Width="228" Height="144">
<Listeners>
<Focus Handler="while (edResume.getValue().indexOf('<br>') > 0) edResume.setValue(edResume.getValue().replace('<br>', '\n\r'));" />
</Listeners>
</ext:TextArea>
</Field>
<Content>
<ext:FieldContainer ID="FieldContainer1" runat="server" Layout="HBoxLayout" Width="100">
<Items>
<ext:Button ID="btnSaveResume" runat="server" Icon="Accept" Flat="true" />
<ext:Button ID="btnCancelResume" runat="server" Icon="Decline" Flat="true" />
</Items>
</ext:FieldContainer>
</Content>
<Listeners>
<Deactivate Handler="pnlResume.innerHTML = pnlResume.innerHTML.replace(/\n\r?/g, '<br />');" />
</Listeners>
</ext:Editor>
</div>
</Content>
</ext:Panel>
</Items>
</ext:Window>
If I show this window then I close it, the edtResume element still remains in the Body and is accessible via JavaScript.