fixed ArgumentOutOfRangeException #248
fixed ArgumentOutOfRangeException #248

fixed ArgumentOutOfRangeException when the grid has only a single row
fozzedout/winforms-modernui,cravelight/winforms-modernui,marzeg/winforms-modernui,barecool/winforms-modernui,marzeg/winforms-modernui,fozzedout/winforms-modernui,cecon/winforms-modernui