The only issue with the solution I mentioned is that I don't know any way to change the label display.  I would somehow need to introduce a value converter or something.  My solution would correctly place a label at the values 50, 100, 200 etc, but these values would be the logs of those values 5.64, 6.34, 7.03 etc.  Is there anyway that the template used to display the label could be modified to add a value converter, or any other way, so that I could display 2 ^ value instead of the values?

Hello,

I can say that the Labels are calculated internally and you can onlu set the Axis' Minimum, Maximum and Interval Properties based on which the Labels are calculated, so I believ that the approach your are using is the best one to achiev the functionality you want. If I think of another possible approach for this I will let you know.

Hi,

Thanks for the response.  Unfortunately it doesn't really solve the problem for me, although it helps.  It gives me the minimum value for the cross-over, ie 50, but not the multiples of 50, eg 100, 200, 400 etc.  Is there any way, perhaps in the code-behind, that I could manually override the placement of the axis labels, or any other work-around you can think of that would also produce the 100, 200 etc.  

One variation I could think of using your solution as a base would be to set the minimum and maximum of the false axis in the code behind to be log2 of the actual minimum and maximum, and it's interval to log(2).  Then it would just be a case of over-riding the label display format to display 2^{label value}, although I'm not sure how I could override the displayed label?

Thanks,

Graeme