How to draw an arc grid?

[cxr1835]

I am a new Revit user, I want to know that how to draw an arc grid? :?:

[beegee]

Select grids from the Basic tab design bar, then draw using either the arc center or arc by 3 points button on the options bar.

[cxr1835]

o,but I can not find the choice what you said above...... :oops:

[Scott D Davis]

It's new to Revit 6.0. Are you using 5.1?