This dialog lets you create custom modifier and button sets for the Modify panel.

Modify panel >
(Configure Modifier Sets) > Configure Modifier Sets dialog
Lists all modifiers currently available. It's organized into these categories: Channel Info, Max Edit, Max Standard, Deformations, Max Surface, Surface Tools, Modifiers, Radiosity, LIGHT, Max Additional, Shell, Spline Edits, World Space Modifiers, and others. To add a modifier to the current button set, drag the modifier's name from this list onto a button in the Modifiers group box.
Lets you choose the modifier set to edit. To create a new button set, enter the name in the edit field, and then click Save.
Saves the current button set.
Deletes the current button set. Not undoable.
The number of buttons in the button set. A button set can have up to 32 buttons.
Previews how the button set will appear on the Modify panel. Because the box shows only 16 buttons at a time, a scroll bar on the right lets you see any remaining buttons.
To change a button, drag the name of a modifier from the Modifiers list to a button in this group box, or click the button (its border highlights) and then double-click the modifier name.