VRML transparency

I wish to alter the transparency of a transform node (B747.wrl) which came with the Simulink 3D Animation toolbox.

Unlike simplier nodes - this is made up of multiple transforms - each with its own transparency field. How can I make the whole plane transparent (this is from looking at the wrl in the 3d world editor).

Further, in MATLAB the transform node ('plane')doesn't indicate access to these fields? I wish to alter the transparency in my matlab code.

please help