Question: Using "display" command in Maplets

I am using Maple 16, and trying to display several 3d plots simultaneously in a maplet (e.g. a line and a plane, etc.).  Whenever I use the "display" command the Plotter gives me 2-d axes.  

How can I get the display command to work in Maplets?

For example:

returns the axes in a plane, whereas

returns two surfaces (here the text fields are functions of x and y).

Thanks for any help you can give,

Rollie

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