Although required as a parameter, we do not use the id assigned to the control element in our handler. When we make a call to the methodGroup's function get_int_val, we get the ordinal value of the radio button within the group. The ordinal value is the order in which the buttons were created within the group starting with 0. Thus, we make our selection of the appropriate value to send to cgWorld based on the ordinal values. The values that we can send via the function setTextureMethod are defined in CGWorld.h.