Problems with ActualWidth not being recalculated

Question

How come is the ActualWidth of a DataGridColumn is not affected by changing the value of its Width property but it is when I change the value of its MinWidth? In other words how does ActualWidth get computed or changed ?

Answer 1

There is actually a difference between using:

double width = 25.0;
myDataGridColumn.Width = width;

and:

double width = 25.0;
myDataGridColumn.Width = new DataGridLength(width, DataGridLengthUnitType.Pixel);

The latest activates the recomputing of ActualWidth but not the first one.

Don't know why.