Apple Numbers '09 - Manual (Page 100)

Click the Checkbox button in the format bar. Unchecked checkboxes are added to
selected cells.
Checkbox button
You can also click Inspector in the toolbar, and then click the Cells inspector button.
Choose Checkbox from the Cell Format pop-up menu, and then select the initial state
(Checked or Unchecked).
To add a slider, click the Cell Formats button in the format bar and then choose Slider
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from the pop-up menu. A slider with default settings, visible in the Cells inspector,
is created.
You can also open the Cells inspector and choose Slider from the Cell Format
pop-up menu.
In the Cells inspector, change default settings if desired:
Minimum and Maximum: Indicates the lowest and highest cell values.
Increment: Indicates the amount by which the cell value increases or decreases when
you move the slider (or arrow keys) one increment.
Position: Lets you locate the slider to the right of the cell or at the bottom of the cell.
Display as: Applies a number, currency, percentage, fraction, scientific, or numeral
system format to the cell values.
Decimals: Indicates how many decimal places to display.
To add a pop-up menu, click the Cell Formats button in the format bar and then
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choose Pop-up Menu to create a pop-up menu with default settings.
You can also open the Cells inspector and choose Pop-up Menu from the Cell Format
pop-up menu.
In the Cells inspector, edit the placeholder entries in the list by selecting them and
typing values of your choice.
To add an item to the list, click the Add button (+) and type the item. If you specify a
number, it’s treated as a number, not as text.
100 Chapter 4 Working with Table Cells