This recipe will outline the features of the Theme developer module. We will use it to demonstrate the steps to be followed to locate the theme function or template being used to display a particular element in a page.
The Theme developer module can be downloaded from http://drupal.org/project/devel_themer. It depends on the Devel module which we looked at in the previous recipe. Both of these modules need to be downloaded, installed, and enabled.
Once Devel has been installed, we will also need to enable the Development block in order to readily access all of its features including those pertaining to Theme developer. This can be done from the block administration page at