Hi, I am using XCode 2.4.1 with OBJ - C (Cocoa framework) I have created an application with all required NIB's and implemented all its functionality. Its working fine. Now my boss asked me to put a Checkbox(NSButton) and implement its functionality in a dialog. I know how to do it in a dialog from scratch and create necessary classes (files). Now when I try to add a checkbox, its attributes and actions, all the functionality of the classes(files) will be over written. So, how can I add a new Button to a dialog now. Thanks in advance. satyam.