Ali, Raymond gave you the correct advice that you need to read the help file for iGrid that describes all main concepts of the control. At least, its introductory part for the programmer. Then you will understand how to translate your MSFlexGrid code to the equivalent code for iGrid.
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Flexgrid's Rows and Cols properties are RowCount and ColCount in iGrid. Row and Col can be coded as CurRow and CurCol.
As for RowSel/ColSel, iGrid uses multiselection mode (see the MultiSelect property) in which any arbitrary cell can be selected using the CellSelected property. The SelItems property returns the list of cells selected at the moment.