About the Todo list toolbar icons

Following are the icons that appear when the Todo List view is active.

Icon	Description
Add	Opens the Add window. Use this icon to add a new item to your Todo checklist and assign a Summary and Group to the item. This icon is available even if no items are selected.
Mark Complete	Dims and lines-through the selected item(s) in the Todo list so that the item(s) appear to be crossed off the list. If the item is already marked as completed, clicking this icon restores the item to its un-crossed-off state. With no items selected, this icon is dimmed (unavailable).
Edit	Displays the Edit window, allowing you to change the Summary and the Group fields associated with the item.
Move to Top	Moves the selected item to the top of the list.
Move Up	Moves the selected item up in the list, one increment per click.
Move Down	Moves the selected item down in the list, one increment per click.
Move to Bottom	Moves the selected item to the bottom of the list.
Remove	Displays a “Remove selected items?” prompt and deletes selected items when you affirm the prompt.