creating solid material for the reaction in the fluent
 

Hi all,I want to define a particle surface reaction in the fluent,excepting my fluid mixture,I created my 2 new solid materials with the Material Type of Solid,But after clicking Edit in the field of mixture Species (when the material type of Mixture is selected) I can not see my 2 new solids in the Species box under available materials,
How can I see my solids?