It's an item, displaying input controls, which allows user to enter a filter values for each visible column in a GridTableView. By default the columns render a textbox and a button, displaying the filtering menu on click. This item is visible based on the settings of AllowFilteringByColumn property. The items is displayed right under the header row of a GridTabelView.

public class GridFilteringItem : GridItem

Public Class GridFilteringItem
	Inherits GridItem

public ref class GridFilteringItem : public GridItem

type GridFilteringItem =  
    class
        inherit GridItem
    end