The short version is that I want to add members to a non-persistent class via the Module.CustomizeTypesInfo method, but because it is non-persistent, I cannot figure out how to get a reference to which I can add a member; ITypeInfo.CreateMember returns an error when trying to add a property, and XPDictionary.GetClassInfo doesn't seem to find non-persistent types.
Now for the full explanation, in case there is perhaps a better way:
I have a [Project] type, which has a large number of non-persistent properties. In the interest of keeping the field selection from becoming too cumbersome (both for list view column chooser, and for filter editing), I want to use non-persistent 'container' classes that can be referenced by the [Project] to group related properties. For example, there are a number of [Event] types that can be assigned to a Project, and are regularly desired to be displayed as columns in a list view. The possible types of Events are defined at run time, so I cannot create the properties at design time. I can create the fields directly in the [Project] type using CustomizeTypesInfo, but as this is just one of several such groups of dynamic fields, the number of [Project] properties if I use this method quickly passes 100.