hi I am using Phalcon Datatables Plugin based on that source files are in my plugins folder and I"ve already registered that
php         "pluginsDir"     => APP_PATH . "/app/plugins/", 
I"ve got my own namespace
php          $dispatcher->setDefaultNamespace("MyNS\Controllers");
DataTables has its own namespace as well.
when I try to use it, it couldn"t find classname DataTable 
    My Controller
        namespace MyNS\Controllers;
        ...
        use DataTables\DataTable;
        ...
        use \DataTables\DataTable;
        $dataTables = new DataTable();
        ...
        $dataTables = new \DataTable();     
        ...
        $dataTables = new \DataTables\DataTable();      
        ...Class "DataTables\DataTable" not found in none of them worked..!