3D Line (Vertical in Z-axis) does not show in Graphic

[RyanDay]

We have Vertical lines, that have the same X,Y but varying Z coordinates.  We were hoping to still be able select these lines in a Graphic (and the User see a dot), but it doesn't seem to be working.  A selection will pick up the feature, and with the right symbology (line thickness) ArcGIS Server will display the point, but a Graphic doesn't seem to be able to show a marker...

Any ideas?

[RyanDay · Accepted solution]

Note, this an issue only for Graphics using SimpleLineSymbol(), the CartographicLineSymbol() seems to work for me.