title: Excel like filter is applied to rows instead of columns with primeng DataTable
body: <p>I used the code given in <a href="http://www.primefaces.org/primeng/#/datatable/filter" rel="nofollow noreferrer">http://www.primefaces.org/primeng/#/datatable/filter</a> to create excel like filter but it is getting applied to rows instead of columns. Below is the code used. </p>
  
  <pre><code> &lt;p-column field="color" header="Color (Custom)" [filter]="true"
       filterMatchMode="in" [style]="{'overflow':'visible'}"&gt;
          &lt;template pTemplate="filter" let-col&gt;
              &lt;p-multiSelect [options]="colors" defaultLabel="All Colors" 
              (onChange)="dt.filter($event.value,col.field,col.filterMatchMode)" 
             styleClass="ui-column-filter"&gt;&lt;/p-multiSelect&gt;
          &lt;/template&gt;
      &lt;/p-column&gt;
  </code></pre>