@Override
public void onMouseMove(MouseMoveEvent event) {
groupingBoundsWidget.setHeight(event.getClientY() - groupingBoundsWidget.getAbsoluteTop() + "px");
groupingBoundsWidget.setWidth(event.getClientX() - groupingBoundsWidget.getAbsoluteLeft() + "px");
}}, MouseMoveEvent.getType());
panel.addDomHandler(new MouseUpHandler(){
@Override
public void onMouseUp(MouseUpEvent event) {
VkDesignerUtil.releaseCapture(panel);
selectWidgets(panel, groupingBoundsWidget.getAbsoluteTop(), groupingBoundsWidget.getAbsoluteLeft()
, groupingBoundsWidget.getAbsoluteTop() + groupingBoundsWidget.getOffsetHeight(), groupingBoundsWidget.getAbsoluteLeft() + groupingBoundsWidget.getOffsetWidth());