What if I want to do this at run time. Specifically what is this <ColumnDefinition Width="*"/> in code?

Try something like this:

            ColumnDefinition col = new ColumnDefinition();

            col.Width = new GridLength(1, GridUnitType.Star);

So assuming I want to do this to the last visible column and this is in generic code (hence no xaml) and I don't know howmany columns or anything like that. I catch FieldLayoutInitialized and manipulate the layout to match the information i want to display such as which columns in the object etc. I just want the last column to fill all of the space left in the window whatever that happens to be.

So I am hoping there is some kind of thing like

field.settings.collumndeffinition = (your code)   or

grid.array[field.index] = (your code)

Thanks

I have a follow on question which is assuming that I have objects which contain objects so that say the root object has 2 columns and the one kind of child object has 3 how do I get the second column in the root and the fifth on the child?