The XYCursor has a property 'Plot', and this the only property you can use to connect the Cursor with 'Real World': XyCursor1.Plot = WaveformPlot1
The WaveformPlot has a property XAxis. You can switch between x-axes by assigning WaveformPlot1.XAxis = XAxis1 or WaveformPlot1.XAxis = XAxis2 After you reassigned the XAxis property for your WaveformPlot, your XYCursor will automatically use the XAxis you assigned.