Hi,
What version of VC and EP are you using?
Where do you get this read only icon?
As for data sources disappearing when you drag them to the window:
In order to place a data source as part of a model, you'll have to place inside an IView. If you try to place a data source at the model\module level, it will fail and the data source will disappear.
Hope I helped,
Lior
Add a comment