DataGrid: cell value, column name?

[viktoras d.]

now replacing my table object with Trevor's excellent DataGrid in one 
project, but somehow can not figure out how do a few elementary things 
from within script:
1) get the value of the current cell of a table
2) get the title of the current column of a table
3) get the current record number of a table
4) get the value of a cell of a table by column title and record row number

any hints or pointers?

Thanks!!!
Viktoras