When you develop a dynamic page and select a server behavior from the Server Behaviors panel, Dreamweaver inserts one or more code blocks into your page to make the server behavior work.
If you manually change the code within a code block, you can no longer use panels such as the Bindings and Server Behaviors panels to edit the server behavior. Dreamweaver looks for specific patterns in the page code to detect server behaviors and display them in the Server Behaviors panel. If you change a code blocks code in any way, Dreamweaver can no longer detect the server behavior and display it in the Server Behaviors panel. However, the server behavior still exists on the page, and you can edit it in the coding environment in Dreamweaver.