i have made this in .rss file and it is working .
RESOURCE MTUD_FUNCTION_ARRAY r_textud_function_array
{
functions=
{

MTUD_FUNCTION
{
functiontext = "Zozoc";
command = KMtmUiMceSettings;
flags = EMtudCommandTransferSend;
},

MTUD_FUNCTION
{
functiontext="Refresh service";
command=ETxtuCommandRefreshMBox;
flags=EMtudCommandTransferReceive; },

MTUD_FUNCTION
{
functiontext = "Message command";

command = ETxtuCommandMessage;
flags = EMtudContextSpecific|EMtudAsynchronous|EMtudCommandTransferReceive;
}
};
}

now i want to make :- messaging->settings->self made option->want to make option here