Modify VBO checkbox value I would like to modify the value of my VBO checkboxes but can't figure where to hook in.

&lt;input name="objects[selection][1]" id="edit-objects-selection-1" value="1" class="form-checkbox select" type="checkbox"&gt;


becomes

&lt;input name="objects[selection][1]" id="edit-objects-selection-1" value="1-XXX" class="form-checkbox select" type="checkbox"&gt;
I guess it should be form, so you can try the following on VBO page, if it workds.

   function  mymodule_form_alter(&amp;$form, &amp;$form_state,$form_id) {
      dpm($form_id);
    }