I have hit a snag in developing a stacked chart.  I've been following the web chart basics tutorial at http://www.devexpress.com/Products/NET/Controls/Charting/QuickStart.xml - but instead of choosing a "stock" chart I chose a "stacked" chart.  I would like to display

X-axis: ThingDate

Stacked data 1: CompletedThing

Stacked data 2: IncompleteThing

I'm stuck at stacking two ValueDataMembers.  I go to chart properties - Elements - Series, click the Collection ellipses and add a series of type "Bar Stacked". I then go to Properties in the Serices Collection Editor, set the ArgumentScaleType to DateTime and set the ArgumentDataMember.  So far so good ...  At this point, I try to set my two ValueDataMembers and I get stuck.  There's only one member in the collection, "Value 1".  I can't add a second member, and I can't create another Series because I get a dialog that says the Series types are incompatible.

So, how do you create the next series in a stacked bar chart?

nevermind - looks like when you add the second series, the ArgumentScaleType has a default of "Qualitative" and the message:

This series is incompatible:
by the argument scale type with "Completed".

just means you need to change it to be the same as the first series' (eg DateTime).  that message *could* be a little clearer tho :)