In a standard Windows project, I created a couple of xml schema and used the generate data set tool under the schema menu. I could then view the schema as data sets and they look right - so far so good. However, when I try to instantiate them by dragging a data set onto a form, as described in the help files, I have problems. The IDE correctly lists the xml schema under typed datasets, but when I hit OK I get told that VS can't instantiate the data sets. Underneath it says to build the solution, fix any errors and try again. I build - get no errors or warnings - but when I go through the process again I get the same error message. What am I missing?