[ExtJS 3] Can't close tab at tab panel

[Softwarer]

Did anybody succeed in closing extjs' tab sheet via Selenium?

I have a tab panel:

var panTabs = new Ext.TabPanel({
region: 'center',
id: 'main-form-page-control',
border: false,
activeTab: 0,
tabWidth: 150,
resizeTabs: true,
items: [panResult]});

with a tab sheet on it:

Ext.apply(editCard, {closable: true, border: true, id: card_id});
...
this.panTabs.add(editCard).show();

I'm trying to automate it:

panEdit = findElement(panTabs, By.metaID("card-%d-new-record",
dicName), "Can't locate edit pane");
assertTrue("Edit pane unavailable", paneEdit.isDisplayed() &&
paneEdit.isEnabled());
....
findElement(paneEdit, ..... some work with edit card
....
WebElement tab = findElement(panTabs, By.metaID("main-form-page-
control__card-%d-new-record", dicName), "Can't locate tab");
WebElement btnClose = findElement(tab, By.className("x-tab-strip-
close"), "Can't locate close button");
btnClose.click();
testResultPaneActive();

It works fine until btnClose.click() which simple do nothing. Html for
close button is:

<ul id="ext-gen51" class="x-tab-strip x-tab-strip-top">
<li id="main-form-page-control__panelPanResult" class="">
....
<li id="main-form-page-control__card-7-new-record" class="x-tab-strip-
closable x-tab-strip-active">
<a id="ext-gen259" class="x-tab-strip-close"></a>
<a id="ext-gen260" class="x-tab-right" href="#">
<em class="x-tab-left">
<span class="x-tab-strip-inner" style="width: 121px;">
<span class="x-tab-strip-text ">New Record</span>
</span>
</em>
</a>
</li>
<li id="ext-gen52" class="x-tab-edge">
<div id="ext-gen53" class="x-clear"></div>
</ul>

a.x-tab-strip-close {
background-image: url("../images/default/tabs/tab-close.gif");
}

I'm pretty sure that I need to click at x-tab-strip-close cell (a
small image really) but I have no idea how to do it - it looks like
Selenium treats element as non-clickable.

[Softwarer]

Sorry, I found decision. It isn't Selenium issue, just ExtJS
'feauture'. With simplier tab sheet this method works fine.