How to edit subviews of a custom cocoa plugin

If you add a custom view to a xib, then add a textfield, you can select the textfield and edit properties.

If I create a custom view as a plugin and it has a textfield as a开发者_运维技巧 child view, how do I edit the values of the textfield at design time when using the plugin?

- (NSArray *)ibDefaultChildren;