A long expression that defines the width of the buttons in the editor, added
using the AddButton method.
Use the ButtonWidth property to increase or decrease the
width of buttons in the editor. The button's height is the same with the NodeHeight
property. If the ButtonWidth property is zero ( 0 ), the control hides
the buttons. Use the AddButton method to
add new buttons to the editor. Use the Editor
property to assign an editor to a node.
