This feature is broken.
I set this property to 1.  Moving columns is allowed in the grid.
So, I can move the second column, before the first, and now it becomes the frozen column.
This is not what I want.  The first column should remain frozen, no matter what. You should not be allowed to move other columns in front of it, causing that column to become the frozen column.
I still want other columns that are not frozen to be allowed to move around.  But I also want the first column (or however many) to remain frozen on the left, regardless of what the user does with the rest.