By default, the DisplayGroupingButton property is False. The DisplayGroupingButton property indicates whether the header of the date displays the grouping button. The list of available groups is displayed on a drop down panel, once the user clicks the grouping/filtering button. The drop down list shows the Title for each group found. The ShowGroupingEvents property indicates whether the control displays events grouped by its GroupID property. The ApplyGroupingColors property specifies whether the control uses the Group's EventBackColor / EventForeColor / EventPattern properties to show the events in the groups. The SingleGroupingView property specifies whether the drop down panel shows radio buttons, instead check boxes, so the user can see all groups or only one group at the time. The GroupID property specifies the identifier of the group where the event belongs. If the control displays groups the GroupID property of the newly created event is automatically updated with the group where the event has been created. The AllowMoveEventToOtherGroup property specifies whether the user can move an event from a group to another at runtime. Use the Add method of the Groups collection to add new groups to the control. 

The grouping button is displayed if:

• DisplayGroupingButton property is True
• ShowGroupingEvents property is True

The control displays groups if:

• ShowGroupingEvents property is True
• The Groups collection has elements. By default, the Groups collection contains no Group objects.

The following Background properties change the visual appearance of the drop down grouping panel:

• Background(exGroupingBackColor) / Background(exGroupingForeColor) changes the background and the foreground color of the panel.
• Background(exGroupingSelBackColor) / Background(exGroupingSelForeColor) changes the background and the foreground color of the selection in the panel.
• Background(exCheckBoxState0), Background(exCheckBoxState1), Background(exCheckBoxState2) changes the visual appearance for the control's check boxes.
• Background(exRadioButtonState0), Background(exRadioButtonState1), changes the visual appearance for the control's radio buttons.

The Description(exGroupBarAll) property changes the "(All)" predefined string, being displayed on the top of the drop down grouping/filtering panel. 

The following screen shot shows the drop down panel, if the SingleGroupingView property is False ( by default ):

The following screen shot shows the drop down panel, if the SingleGroupingView property is True: