The filter control can be invoked by clicking the filter image or filter expression displayed in the filter bar. To show the filter bar, set the TreeListSettings.ShowFilterBar property to one of the following values.
How to Specify the Filter Control Elements Visibility
End-users can create filter criteria using the Visual tab or by typing the criteria as text (Text tab). The Text tab is disabled by default. Set the ASPxGridFilterControlSettings.ViewMode property to VisualAndText to enable both the Text and Visual tabs. A tab's content is automatically synchronized.
The operand type button allows end-users to switch a filter condition between two modes: comparing a field's value to a value; or comparing a field's value to another field's value. Use the ASPxGridFilterControlSettings.ShowOperandTypeButton property to show this button visible.
Visibility of Filter Operators
The filter control drop-down window displays different comparison operators based on the column data type. The table below lists comparison operator's visibility for different column types.