locate function exiting when point given in free space

Hi All,
I am using 
mdlState_startModifyCommand(exFun,DataFun,NULL,NULL,NULL, 0, 13, TRUE,
0);
I use mdlLocate_setFunction (LOCATE_POSTLOCATE, elmFilter);
to have only linestrings. When I give a point in free space the mdl
exits. I need the error message to be flashed that element not found and
should continue like delete command does.
i tried to use 
mdlLocate_setFunction (LOCATE_NOTFOUNDFUNC, notfoundFunc);
but when I give reset then also it goes to notfoundFunc. result is not
satisfactory.
SO could anyone suggest me .
Thanks you
lee


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