Meltdowns

My 4 year old is having a meltdown again. He cannot rationalize, cannot even eat his lunch because he is consumed with the notion that his brother is playing with his wooden cupcake set.
"But the cupcakes are in the oven and they will not be ready for Daddy if he plays with them."
I remind Silas that he promised to share the set when I bought it for him and since Eli has already finished eating, Eli can play with the set until Daddy gets home.
The tears begin to fall, Silas is screaming and heads for his little brother to take the matter in his own hands. I shield Eli from him and firmly tell Silas that it is Eli's turn and there is to be no more arguing about it.
Finally, Silas sits down to eat. Eli is sitting beside him playing with the cupcake set. Silas can't take his eyes away from his brother.
"But he is going to put dots on the cupcakes and I already have them decorated."
"Silas-not another word."
"But I can't let him do that. I just can't." Silas whines. And then it is quiet for a moment.
Silas calmly leans over to Eli and in the sweetest big brother voice says, "Eli, can you pick up the cupcakes and put them back where they belong?"
Eli wants to please his big brother so he picks one up and puts it back in the box.
"Good job, Eli! Now do the next one." Under my little manipulator's instuction, Eli puts each one back in the box.
"Good. You did it! Now its time to put them away" and Silas picks up the box and carries it off!