Place a textbox within a specific cell in a table.

We are currently generating a table and we want to make the fields within a specific column editable. I want to place textboxes within the cells of the editable column but the problem is that I can't find the coordinates of the cell on the page so that I can position the TextBox. Currently when I look at the rectangle location of the TextFragment in the cell, it gives me the coordinates relative to the cell and not relative to the page so the TextBox ends up being at the bottom left corner of the page.

To summarize:

- How do a place a TextBox inside a specific cell of a table.

- How do I set the size of the TextBox to the size of the cell. 

We are coding in C#.

Thank you in advance.