speedbar-special-mode-expansion-list

speedbar-special-mode-expansion-list is a variable defined in `speedbar.el'.
Its value is

nil

Documentation:
Default function list for creating specialized button lists.
This list is set by modes that wish to have special speedbar displays.
The list is of function names. Each function is called with one
parameter BUFFER, the originating buffer. The current buffer is the
speedbar buffer.