Hi Geovanny,

Thank you for report.
WebExplorerBar does not have an option to cancel navigation.

An application may get around by processing and canceling original "click" browser event.

The ClientEvents.ItemClick can not be used for that purpose, because it is raised not on "click" event, but on "mouseup". Since browser raises "click" after "mouseup", application may process ItemClick which provides reference to item and set the "cancel-click" flag, which will allow the click-handler to cancel event and prevent default navigation to A.href.

Below is example for you:

function WebExplorerBar1_Initialize(sender)
{
  $addHandler(sender.get_element(), 'click', function(e) {
     // cancel navigation by A.href
  if (sender._cancelClick)
     $util.cancelEvent(e)
     });
}
function WebExplorerBar1_ItemClick(sender, eventArgs)
{
    // reset cancel-navigation flag
    delete sender._cancelClick;
  // condition to cancel navigation by A.href
  if (!eventArgs.getExplorerBarItem().hasChildren()) {
    // set cancel-navigation flag 
    sender._cancelClick = true;
    UrlSelected(eventArgs);
     } else {return;}
}

<ig:WebExplorerBar ...>
  <ClientEvents ItemClick="WebExplorerBar1_ItemClick" Initialize="WebExplorerBar1_Initialize" ItemSelecting="WebExplorerBar1_ItemSelecting" />
  ...
</ig:WebExplorerBar>