Grid Heading

why can't I change the grid column headings in the object inspector , Like 
TMSFMXGrid1.Columns[1].DisplayName := 'No of Bins';

but this is also not working if I do it in the code at runtime

I got this firemonkey component for the grid functions

Please assist

There is not a possibility to set a column header text at this time via the grid.Columns[] property.
You'd need to set this using 

grid.Cells[column,0] :='header';