CL_SALV_WD_FE_TOGGLE_BUTTON with alv

hi,

the class CL_SALV_WD_FE_TOGGLE_BUTTON has a string parameter "checked_elementname" in its constructor.

what should I pass as parameter to the construcor?

can someone explain me the principle of togglebutton with alv

or

has someone an example?

the class docu of CL_SALV_WD_FE_TOGGLE_BUTTON doesn´t help me...

regards