I can?t find  any doc for TTMSFNCGridBinder.

What is the use of it and what can I do with it?

This non-visual component can be used to connect multiple grid instances together and add inter grid formula calculating functionality. Drop TTMSFNCGridBinder on the form and add several grids on the TTMSFNCGridBinder.Grids[x].Grid, give each grid a name via TTMSFNCGridBinder.Grids[x].Name.  Then you can use formulas with references  : sheetname!cellref where sheetname refers to the name of other connected grids.

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