Datagrid - tooltiptext

I want to show a tooltiptext for each item in the first column of the datagrid, when moving the mouse across the column of the datagrid. This tooltiptext has to show the complete description of the item in the column, as the description can not be fully shown in the column itself (too long = memo field from Access database).

I know that scrolling would be the most logical solution in order to see the complete description, but I would like to solve this with a tooltiptext, because the user of the programme has to fill in the last column (of five) of the datagrid and in this case, the user would not be able to see the first part of the datagrid anymmore when he arrives in the last colum and it is absolutely necessary for him/her to see all columns in one view.

Can someone give me some advice about this please ?