Eigen Modes along Z-axis

Dear All,

I am Pradeep from portland,recently started my work on COMSOL.As i m basic started i tried to start up by building a rectangular box and find out the eigen modes in it. But i can observe eigen modes in all the palnes except the Z-axis. My geometry is just a 3D rectangular box. I found eigen modes like TE120 TE130..... but i am not able to find out eigen mode for TE111 or TE110 or TE222 TE 131.........

Thanking you in advance