Gravity Forms CSS Ready Class Selector is a WordPress plugin by bradvin an add-on for the Gravity Forms Plugin.
Gravity Forms CSS Ready Class Selector Popup
“Ready Classes” were introduced in Gravity Forms 1.5. Using these new classes, you can easily create more advanced alternative layouts for the fields in your forms. Excellent idea, however, the problem is you always need to remember what the exact class name is. Now with the CSS Ready class selector, you don’t need to remember. Simply click on a button to lauch the popup and choose the class you want to add from the list.
features
Convenient button added under the advanced tab next to the “CSS Class Name” field
Clean and simple popup that lists all the “Ready Classes”
Add more than one “Ready Class”
Double click a “Ready Class” to add it and auto-close the popup
Download: http://wordpress.org/extend/plugins/gravity-forms-css-ready-selector/