I apologize because it seems I've not been clear in the requirements. I don't need dates to stack based on each day I need them to stack the same as a "DateTimeCategoryAxis" that other version can use. The description you all have for that is: "DateTimeCategoryAxis is a special type of axis used mainly with financial series. All the data points are plotted with equal spaces, similar to CategoryAxis, thereby removing space for missing dates. Intervals and range for the axis are calculated similar to DateTimeAxis. There are no visual gaps between points, even when the difference between two points is more than a year."
The reason we don't use a DateTime Axis is we may have many data points sets in a single day which each need to show as a separate columns, and then there may not be any data for a couple of days, and then just one data point set, etc. A DateTime axis would leave a lot of empty space we don't care about. We need a stacked column for each data set stacked based on them having an identical timestamp, so it shouldn't matter if there are 10 in a day or 0. In the past the Stacked Column series would stack based on the X values matching (regardless of them being a DateTime, string, int whatever) which achieves this objective.
I'm confused as to the reason for the change in behavior. Having the Category Axis stack based on the index of the data point eliminates the possibility for any data set that has two or more series where the number of datapoints don't exactly align with each other. Anyway, I'm looking for a way to modify your example to accomplish the same thing, but it seems to be a bit over my head.
Thank you again for any assistance. We chose Syncfusion because it can do both WinRT and Xamarin Forms, but it's certainly difficult to do this when they have completely different ways of accomplishing things. We're getting close to needing to ship on Xamarin and right now the only things preventing us from doing so are this issue, and the issue with TreeMaps that we posted about before. We do understand that Xamarin Forms is new to pretty much everyone, so again we appreciate any help you can give to let us achieve the same behavior between WinRT and Xamarin.