Unable to implement interface IF_FPM_GAF_CONF_EXIT in standard webdynpro component

Hi,

1) I am not able to implement interface IF_FPM_GAF_CONF_EXIT in standard webdynpro component using enhance button.

2) I have a requirement need to Hide some Main steps and buttons in GAF at run time, I try to hide buttons thru start configure using admin mode but I don't know why the button are appering at runtime but in design mode those are showing as diable/hide.

pls. advice me on this.

Thanks

Murali