ClickElement

Hello,

My action 'ClickElement' isn't an error but this action is no effect.

My HTML Page is :

<div class="command" id="_c_12">
<div class="img">
<img src="ts_/hfs/img/large/viewDay.png?_ts_=1028093472">
</div>
<div>Vue Jour</div>
</div>

If my cursor is on the picture, my HTML is

<div class="command_enter" id="_c_12">
<div class="img">
<img src="ts_/hfs/img/large/viewDay.png?_ts_=1028093472">
</div>
<div>Vue Jour</div>
</div>

And one click, my page load.

With Ctrl+U in FF, i have this line :
R("CommandBarItem","_c_12",{"$events$":{"onexecute":$eh_15}});

In webtest, i tried :
<clickElement xpath="//div[@id='_c_12']"/>
<clickElement xpath="//div[@id='_c_12']/div[1]/img"/>

Selenium is OK with this line
Click //div[@id='_c_12']/div[1]/img

I don't understand...

Thanks for the help.

PS : I use webtest 3.0.