I've read through several posts this afternoon--maybe I'm still missing something.
I have a grid with a cell that I want to provide a drop down list for.
So I create a ValueList and fill it with the values I want and assign it to the cell.
Also, I set the style of the grid column to be DropDownValidate
However, I'm still allowed to key in a value that doesn't exist--and leave the cell!
Someone, please tell me I'm crazy.
DropDownList might be a better solution for you here.
But DropDownValidate should still work, also. Can you post a small sample project demonstrating that this is not working so we can take a look?