You have CheckboxSelection model which have defines:
However, there is still old checkbox as background-image, because <td class="x-grid3-hd x-grid3-cell x-grid3-td-checker x-grid3-cell-first"> has inside <div class="x-grid3-hd-inner x-grid3-hd-checker">. Last div has inside header template from config.PHP Code:
width : 42,
header : '<div class="x-grid3-hd-checker" style="width: 20px; margin-left: 20px;"> </div>',