I have CorelDraw 11 and make 3 Squares right next to one another. Then I color the middel one Yellow and the 2 end ones Brown. Then I Group all three of them.
Then I take all 3 Squares that I just Grouped and select it and go to my Extrude Tool Box.
And yes I can make it 3D and it works and the 3 Colors Extrude as well it all works.
Now say I start this whol thing again but now I make my 2 end Squares Bigger then the Middel one. Then I Group them and Extrude them it still works but the Yellow one is see through from above.
But like I say if I keep all 3 Squares the same size they all stay a Solid Color when I Extrude them.
Why I just wanted to know?
I do not have V11 installed to test it. And I do not remember about this issue existing in V11. I tested it in X6 and X7 and it works without any issues and as expected.
May be this is a silly question. Did you drag over with transparency tool instead of extrude tool by error ?
No I did not use the Transperancey Tool just go to Effects then Extrude.