if I use the rows preset ID (grid.AddIndex(ID)Wink
and accessing the row by ID (int rownum = grid.Find(rowid, ID); grid.GetRow(rownum))
the program compiles flawlessly but terminates with a runtime error
(I assume the row Id changes during execution since a concurrent thread deletes a row)

it's a sheer PITA to not being able to just grid[rowid].doStuff() with a ficxed rowid not irritated by sortorder or number of rows or position of row on the grid...

// Let us assume that we've defined a Grid object as grid in MyApp;
// Then in your worker thread you can call PostCallback(). 
// Of course you'll need a more complicated version of control code,

//WorkerFoo() represents a  worker thread function.

MyApp::WorkerFoo()
{
        auto rowid = 1;
        PostCallback( [&] { grid(rowid).DoStuff();  } );
}