Hello,

You can use something like this to get to the SortIndicator:

SortIndicator s = Infragistics.Windows.Utilities.GetDescendantFromType(xamDataGrid1 as DependencyObject,typeof(SortIndicator),false) as SortIndicator;

You can also use GetDescendantFromName looking for "SortIndicator", which is the default name of that element inside the ControlTemplate of the LabelPresenter. This way you can control the visibility.

You can also use triggers to do this with binding.

> While doing this I also need to turn off and on the built in sorting (ascending, descending, null) functionality.  

This is controlled by the LabelClickAction property of the FieldSettings.

I came up with a solution although it seems like a whole lot of effort to set an arrow.  First you need to get the LabelPresenter of the grid.  In the callback method when you find the correct LabelPresenter you need to search through its descendants for the SortIndicator and finally set its visibility and direction properties.  I really hope this saves someone in the future a good bit of headache.

private int _columnToSort;

private void myGrid_Sorted(object sender, SortedEventArgs e)
{
    _columnToSort = e.Field.ActualPosition.Column;
    Infragistics.Windows.Utilities.GetDescendantFromType<LabelPresenter>(myGrid, false, new Infragistics.Windows.Utilities.DependencyObjectSearchCallback<LabelPresenter>(DescendentCallback));
}

public bool DescendentCallback(LabelPresenter target)
{
    if (target.Field.ActualPosition.Column == _columnToSort)
    {       
        SortIndicator s = Infragistics.Windows.Utilities.GetDescendantFromType(target, typeof(SortIndicator), false) as SortIndicator;
        if (s != null)
        {
            s.Visibility = Visibility.Visible;

            //logic to set the sort direction here!!!
            s.SortStatus = SortStatus.Ascending;
        }

        return true;
    }

    return false;
}

The code:

SortIndicator s = Infragistics.Windows.Utilities.GetDescendantFromType(xamDataGrid1 as DependencyObject,typeof(SortIndicator),false) as SortIndicator;

has the desired affect.  Unfortunately it always finds sort indicator for the first column in the grid.  I've tried getting to a specific column's indicator with the following code with no luck: 

 private void MyGrid_Sorted(object sender, SortedEventArgs e)

{

SortIndicator s = Infragistics.Windows.Utilities.GetDescendantFromType(e.SortDescription.Field as DependencyObject, typeof(SortIndicator), false) as SortIndicator;

 }

  Do you know how I could modify the above code to get a specific column indicator?  Alternatively if there is a way to get to the specific sort indicator given the field names:

xmlns

:igDP="http://infragistics.com/DataPresenter

igDP:Field Name="ProductDescription" Label="Description" />

<igDP:Field Name="CustomerName" Label="Name" >

Thanks much.

Thanks much for the quick response.  I will check this out and let you know how it goes.