Someone please help ... 

My scenario is that if the user chooses a particular value (combobox) in one column of the grid, another column must either allow him to select further values or it becomes "not applicable". The closest solution I've managed to find was here http://pstaev.blogspot.com/2008/06/having-different-celleditor-for.html. The problem is that in that example, Peter used the value of the current cell in his DataTrigger. My logic depends on a different column. I've tried to access that value using CurrentItem ... but because the row user is still on the same row, it hasn't been commited and you simply get the old value.