Custom Auto ID generation for each type of element or stereotype

Hi all,

Is there a possibility to have custom ID generation for the each type of stereotype in Cameo System Modeler?

ie.. let say I have a custom class as Need and another custom class Goal I would like to have custom ID for each of them 

for the 3 needs it should be  N_1, N_2, N_3 respectively which are to be allotted as soon as I create the need element 

Same for the Goal (G_1,G_2,G_3.. should be assigned automatically when they are created )

Please let me know what are the ways that can be achieved