If you use markers in your graph in conjunction with data transformations then you will encounter a bug. An example of a data transormation would be inverting the X or Y axis (see the excellent discussion previously on this board). Here are the source fixes
to make transformations work with markers:
1. In OnRenderCore method, change
var transform = Viewport.Transform;
var transform = GetTransform();
2. Copy the method UpdateCore() from LineGraph.cs AND all supporting properies and methods to make it compile. (Probably there should be some common base class
to stick all this code so we don't have to copy and paste.