I've made the following change in the Virtual Grid Sample (fillGridButton_Click):
#if DEBUG
virtualGrid.Rows.Options |= RowsOptions.ShowIndicators | RowsOptions.ShowRowHeaders ;
virtualGrid.Columns.Options |= ColumnsOptions.ShowHeaders;
virtualGrid.Options |= GridOptions.MultiSelect;
virtualGrid.Options |= GridOptions.ReadOnly;
#endif
I've executed the code under a Debug so the code would kick in.
Now dragging the mouse to select cells renders random results. First, it is slooooooow. Second, sometime all cells in a rectangle get selected, sometime one is missing, on other occassions, you end up with two areas selected: the old one and the new one.
Could you look into this please?