Question

is there any way to print only the selected rows of GTP.Gantt?

Answer

You can temporarily filter out the rows you do not want to print by setting the Visible property of those GridNodes to false:< ?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

GridNode.Visible  Set to false to temporarily filter out this node from the rendering process (hide it for some reason)