public override void OnApplyTemplate()
{
base.OnApplyTemplate();
// ensure that the custom inactive style is applied
if (FilterButtonInactiveStyle != null)
{
List <FrameworkElement> columnHeaders = UIHelpers.FindElementsOfType(this, typeof(GridViewColumnHeader));
foreach (FrameworkElement columnHeader in columnHeaders)
{
Button button = (Button)UIHelpers.FindElementOfType(columnHeader, typeof(Button));
if (button != null)
{
button.Style = FilterButtonInactiveStyle;
}
}
}
}