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Thanks for your interest in Metro Elements. I've implemented this feature for you just now. To try it out, you'll need to download the next nightly build. This will be available at around 1200 GMT (about 7 hours from now). You'll be able to download this from here: http://www.mindscapehq.com/products/metroelements/nightly-builds
Once you've got tomorrows nightly build, you can use this new feature in the same way as the Y axes feature. Add an instance of ChartAxis to the new AlternativeXAxes collection, and set its Title property. Then on the series that you want to be plotted along this axis, set their XAxisTitle property to the same Title that you set on the axis. Here is a very simple code example (I've used "Alt" as the title to map the series to the axis, you may want something more appropriate if you need to display the title):
Let me know if you have further questions about this.