Hi Brent,
there is no property telling if the AutoFilterControl is currently displayed.
A workaround that should work is to get the IsChecked state of the ToggleButton in the template. This should work in every views and themes since the name of the ToggleButton in the ControlTemplate is always the same: "toggleButton".
To get this working, you must get a reference to the ToggleButton itself:
subclass ColumnManagerCell and override void OnApplyTemplate and do ToggleButton toggleButton = this.GetTemplateChild( "toggleButton" ) as ToggleButton;
subclass ColumnManagerRow and override Cell CreateCell( Column column) to return your custom ColumnManagerCell subclass.
Christian Nadeau
Software Developer
Xceed Software Inc.
