Add an option to clear all filters at once to the column filters.
Currently, you can clear all column filters like so:
this.radGridView.FilterDescriptors.SuspendNotifications();
foreach (Telerik.Windows.Controls.GridViewColumn column in this.radGridView.Columns)
{
column.ClearFilters();
}
this.radGridView.FilterDescriptors.ResumeNotifications();