Changing the z-location of a 2D triplot

Good day,

I have the following code:

 numx=3;
 numy=3;
 xgrid=0:(1/numx):1;
 ygrid=0:(1/numy):1;
 [X,Y] = meshgrid(xgrid,ygrid);
 DT = DelaunayTri(X(:),Y(:));
 triplot(DT)

Which works fine.

I am combing this 2D plot together with a 3D plot. Now I would like to shift the triplot from z=0 to some other z value, for example z=-1.

Can anyone tell me how to achieve this?

Thank you in advance!