AutoCAD VB :: Locating Model Space Objects In A PViewport

In a 2D drawing I want to arrange model space objects in a pviewport such that a specific model space point is in the center of the pviewport.  I'm manipulating the pviewport properties to try to accomplish this.  To have the view perpendicular to the model space XY plane, I've set the pviewport direction property at 0,0,1 and am varying the arrangement of model space objects with the pviewport target property.

When doing this by hand, I use the DVIEW command and the POints option to set the camera and target.  The model space point I want in the center of the pviewport is 16.25,11.5,0.  In the DVIEW command, POints option, I set target to 16.25,11.5,0 and camera to 16.25,11.5,1.

When attempting to do this with a macro I'm not finding any obvious correlation between the pviewport target property setting and the location of the desired model space point.  Below are the lines to set the target property in a pviewport called PVPort created in previous steps.  When I set the target property to 0,0,0, the model space point 45.3541, 17, 0 is in the center of the pviewport.  When I set the target property to 16.25,11.5,0, the model space point 61.6041,28.5,0 is in the center of the pviewport.

If the pviewport has a twist angle of a scale not 1.0 (and therfore a different model space point I'm wanting in the center of the pviewport), it  gets more confusing.

Dim VPP(0 to 2) as Double
VPP(0) = 0: VPP(1) = 0: VPP(2) = 0
PVPort.Target = VPP