adding replicants

System

hi ,
i try to automatically add replicants once the dct is being loaded :
function init()
{
for (i = 1; i <=10; i++)
{
var item = IWDatacapture.getItem("/CrossLinks[" + i + "]/CrossLink");
item.setVisible(true);
item.setValue("test");
// Do something with item.
}
//this doesn't work ..am i wrong or is it impossible to do it ..?
}

In the dct i have :

<item name="CrossLinks">
<replicant required="f" min="1" max="10">
<item name="CrossLink">
<label></label>
<readonly>
<text required="f" maxlength="40" size="40"/>
</readonly>
</item>
</replicant>
</item>

thanks