Materials in DPM-Droplet
 

HI,
I meet a question. I want set two different materials in the droplet of DPM in two different injection. After I set the first injection , I want to set second injection but it doesn't let me choose other materials. :confused:

For example, I set the n-pentane liquid for droplet's material in first injection and then I set the second injection but it just give me 1 material which is my first injection's material ,n-pentane liquid.

I am not good at English.
If you wanna know more information about question , I will upload the screen-shot.
Thanks! :)