ModelSIM and SPI

In the Modelsim display I have 3 signals. The CS which goes low for the transmit period. I have 18 clock pulses at 25 MHz for the SCLK signal and then the data value which is shifted out of the MOSI. On my logic analyzer there is an option to decode the shift register train into a hex number based upon its alignment to the rising edges of the SCLK. I can quickly see the value without having to manually calculate the value. I just thought there would be a simple way to decode the SPI signal for display purposes in Modelsim.