Object datasources vanish from rdlc data sources in web project

[Greg]

Anyone having issues with their object datasources appearing and
vanishing from the datasource browser?

I create an object for binding as a datasource in my App_Code folder,
compile my web project and it appears in the datasources in the report
designer. Then I will make an aspx, setup a reportviewer control for
my new report, go back to the rdlc and the object datasource sometimes
just vanishes.

I refresh, no luck.

The only solution I found is to draft the rdlc to the App_Code folder
where my class is, then refresh datasources and it finds it. Then if I
move it away, they vanish again.

Am I missing something on how the object datasources work in web
projects?