Returns the collection that provides access to the Extend features within the component and supports the creation of new Extend features.
"features_var" is a variable referencing a Features object. | 
        
"features_var" is a variable referencing a Features object. | 
        
| Name | Description | 
| extendFeatures.add | Demonstrates the extendFeatures.add method. To use this sample, have a design open that contains at least one surface body. When you run the sample, you will be prompted to select an open edge of the body. | 
| Extend Feature API Sample | Demonstrates creating a new extend feature. |