>>>>>Thanks a lot in advance,
>>>>_
>>>>I think you have to select the column prior to adding it.
>>>
>>>Do you think I'm THAT stupid? :)
>>>
>>>I select the column (Grid, Edit, select the column) then try to drag and drop from the project.
>>
>>Not with Drag & Drop.
>>Just click on Button in Controls Toolbar and then Click in Column.
>
>Well, this worked. I thought I used to drag it from the project. Now, how can I change it to be my class (though it should not be a big problem to leave as base class)?
>
>I guess I would delete it, add my library to the toolbox and re-add.

Yes,
Just do not use Drag and Drop :-)