MS Flexgrid - Only allow a single row to be selected

Does anybody know if this is possible,

I have allowbigselection set to false and selectionmode set to row

You would have to loop thru the whole row and manually select all the cells.
You can use the .Rows statement to keep track of the last row.

Hi David,

I'm not sure that I follow you. How does this prevent other rows from being selected?

For example if I hold down shift and drag the mouse I can select several rows

No, but you could put code in the mouse up event. What's the problem of seleciting multiple rows? Can't you just check and see if more than one row is selected?
I guess I don't understand what you want to do. I thought you could click in any row and highlight the whole row after clearing any other rows. That way only one row would be selected at a time.

Ummm surely this is as simple as on mouse up event

.rowsel = .row