Hi, further question:

I am not sure if "MSFlexGrid1.SelectionMode = flexSelectionByRo" equals to what i expect.

What i want is, in case the msflexgrid has 10 rows, I can randomly select Row 1, 4 and 5 only by clicking "mouse's left button" while the [Ctrl] key is being pressed. (not selecting Rows 1 to 5)

And there is a textbox outside the msflexgrid, this textbox will display the sum of the amount column in the rows that user has selected.

Thank you.