I am not quite sure I understand your scenario completely and the result you want to achieve. That is why, in order to be able to point you in the right direction and not suggest something based on so little information, I will need detailed information, describing how you want the chart to behave. It will be great if you could provide images, demonstrating the expected result as well and a simple project, demonstrating your setup.
In the meantime, you can consider the following approach - in case, the two x-axes represent different ranges, you could manually set the smaller range to match the larger one. That way, you will not have problems synchronizing the two axes, no matter which approach you choose to implement.
the Telerik team
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