Microsoft Excel lets you add two types of buttons to a worksheet: option buttons and toggle buttons. Option buttons, also referred to as radio buttons, let you choose one item from a list.

Excel 2003's Toggle Switch sets a variable to one of two values -- true or false. The control acts similarly to a check box, but looks like a button, so it suits cases where users must set single ...

As far as Excel is concerned, the Central region has values; they just happen to be 0. If you want to customize a button to react to no data, you can, but the slicer expects no value, not even 0.