set imageSource of text in Data Grid?

[Phil Davis]

Hi folks -

Let's say I have a data grid containing a list of tasks, where each line 
has two columns - col 1 is the task description and col 2 is a space 
character. As each task completes, I want my code to set the imageSource 
of col 2 of that line to the ID of a little "checkmark" image. I feel 
sure this can be done, I'm just not sure how to approach it.

Your ideas are most welcome!

-- 
Phil Davis