I have a very simple task, that drives me completely insane, i just don't get it:

I want a DataGrid, with an attached _STATIC_ datasource, a list, not DB-table.
The sample just needs 1 column, say a number.

And I want a button, that adds a new number to the list, and displays it, without usings hacks like
gird.datasource = nothing
grid.datasource = _STATIC_SOURCE_

I'm pretty sure this is simple, but I don't get it.
(Chose the right username).

I am grateful for _ANY_ ideas.