Checkbox Selector
Press the Shift-Key and make a rectangle-selection with the mouse by clicking-and-dragging. All checkboxes within the selection will change their status (unselected will be checked - and vice versa)
Press the Shift-Key and make a rectangle-selection with the mouse by clicking-and-dragging. All checkboxes within the selection will change their status (unselected will be checked - and vice versa)
