The following VB sample adds an ActiveX editor, ( Exontrol's ExComboBox ):

With XMLGrid1.Editors
    With .Add("excombobox", UserEditorType)
        .UserEditor "Exontrol.ComboBox", ""
        With .UserEditorObject
            .BeginUpdate
            .LabelHeight = XMLGrid1.NodeHeight - 3
            .LinesAtRoot = True
            .HeightList = 256
            .WidthList = 256
            .IntegralHeight = True
            .Columns.Add ("Name")
            .Columns.Add ("Value")
            .ColumnAutoResize = True
            With .Items
                Dim h As Long, h1 As Long
                h = .AddItem("Item 1")
                .CellCaption(h, 1) = "Item 1.2"
                h1 = .InsertItem(h, , "SubItem 1")
                .CellCaption(h1, 1) = "SubItem 1.2"
                h1 = .InsertItem(h, , "SubItem 2")
                .CellCaption(h1, 1) = "SubItem 2.2"
                .ExpandItem(h) = True
            End With
            .EndUpdate
        End With
    End With
End With

The following C++ sample adds an ActiveX editor, ( Exontrol's ExComboBox ):

#include "Editor.h"
#include "Editors.h"
COleVariant vtMissing; V_VT( &vtMissing ) = VT_ERROR;
CEditors editors = m_xmlgrid.GetEditors();
CEditor editor = editors.Add( COleVariant( "excombobox" ), 16 /*UserEditorType*/ );
editor.UserEditor( "Exontrol.ComboBox", "" );
EXCOMBOBOXLib::IComboBoxPtr spComboBox = editor.GetUserEditorObject();
if ( spComboBox != NULL )
{
	spComboBox->BeginUpdate();
	spComboBox->LabelHeight = m_xmlgrid.GetNodeHeight() - 3;
	spComboBox->LinesAtRoot = EXCOMBOBOXLib::exLinesAtRoot;
	spComboBox->put_HeightList( vtMissing, 256 );
	spComboBox->put_WidthList( vtMissing, 256 );
	spComboBox->IntegralHeight = true;
	spComboBox->Columns->Add("Name");
	spComboBox->Columns->Add("Value");
	spComboBox->ColumnAutoResize = true;
	EXCOMBOBOXLib::IItemsPtr spItems = spComboBox->Items;
	long h = spItems->AddItem(COleVariant( "Item 1" ));
	spItems->put_CellCaption(COleVariant(h),COleVariant((long)1), COleVariant( "Item 1.2" ) );
	long h1 = spItems->InsertItem(h, vtMissing, COleVariant( "SubItem 1") );
	spItems->put_CellCaption(COleVariant(h1),COleVariant((long)1), COleVariant( "SubItem 1.2" ) );
	h1 = spItems->InsertItem(h, vtMissing, COleVariant( "SubItem 2") );
	spItems->put_CellCaption(COleVariant(h1),COleVariant((long)1), COleVariant( "SubItem 2.2" ) );
	spItems->put_ExpandItem(h, true );
	spComboBox->EndUpdate();
}

The sample requires the #import <excombobox.dll> to include the ExComboBox's type library. The #import <excombobox.dll> creates EXCOMBOBOXLib namespace that includes all definitions for objects and types that the ExComboBox control exports.

The following VB.NET sample adds an ActiveX editor, ( Exontrol's ExComboBox ):

With AxXMLGrid1.Editors
    With .Add("excombobox", EXMLGRIDLib.EditTypeEnum.UserEditorType)
        .UserEditor("Exontrol.ComboBox", "")
        With .UserEditorObject
            .BeginUpdate()
            .LabelHeight = AxXMLGrid1.NodeHeight - 3
            .LinesAtRoot = True
            .HeightList = 256
            .WidthList = 256
            .IntegralHeight = True
            .Columns.Add("Name")
            .Columns.Add("Value")
            .ColumnAutoResize = True
            With .Items
                Dim h, h1 As Integer
                h = .AddItem("Item 1")
                .CellCaption(h, 1) = "Item 1.2"
                h1 = .InsertItem(h, , "SubItem 1")
                .CellCaption(h1, 1) = "SubItem 1.2"
                h1 = .InsertItem(h, , "SubItem 2")
                .CellCaption(h1, 1) = "SubItem 2.2"
                .ExpandItem(h) = True
            End With
            .EndUpdate()
        End With
    End With
End With

The following C# sample adds an ActiveX editor, ( Exontrol's ExComboBox ):

EXMLGRIDLib.Editor editor = axXMLGrid1.Editors.Add("excombobox", EXMLGRIDLib.EditTypeEnum.UserEditorType);
editor.UserEditor("Exontrol.ComboBox", "");
EXCOMBOBOXLib.ComboBox comboBox = editor.UserEditorObject as EXCOMBOBOXLib.ComboBox;
if ( comboBox != null )
{
	comboBox.BeginUpdate();
	comboBox.LabelHeight = axXMLGrid1.NodeHeight - 3;
	comboBox.LinesAtRoot = EXCOMBOBOXLib.LinesAtRootEnum.exLinesAtRoot ;
	comboBox.set_HeightList( null, 256 );
	comboBox.set_WidthList( null, 256 );
	comboBox.IntegralHeight = true;
	comboBox.Columns.Add("Name");
	comboBox.Columns.Add("Value");
	comboBox.ColumnAutoResize = true;
	EXCOMBOBOXLib.Items items = comboBox.Items;
    int h = items.AddItem("Item 1");
	items.set_CellCaption(h, 1, "Item 1.2" );
	int h1 = items.InsertItem(h, null, "SubItem 1");
	items.set_CellCaption(h1, 1,"SubItem 1.2");
	h1 = items.InsertItem(h, null, "SubItem 2");
	items.set_CellCaption(h1, 1,"SubItem 2.2");
	items.set_ExpandItem(h, true);
    comboBox.EndUpdate();
}

In C# your project needs a new reference to the Exontrol's ExComboBox control library. Use the Project\Add Reference\COM item to add new reference to a COM object. Once that you added a reference to the Exontrol's ExComboBox the EXCOMBOBOXLib namespace is created. The EXCOMBOBOXLib namespace contains definitions for all objects that ExComboBox control exports.

The following VFP sample adds an ActiveX editor, ( Exontrol's ExComboBox ):

With thisform.XMLGrid1.Editors
    With .Add("excombobox", 16) && UserEditorType
        .UserEditor("Exontrol.ComboBox", "")
        With .UserEditorObject
            .BeginUpdate
            .LabelHeight = thisform.XMLGrid1.NodeHeight - 3
            .LinesAtRoot = -1
            .HeightList(0) = 256
            .WidthList(0) =256
            .IntegralHeight = .t.
            .Columns.Add ("Name")
            .Columns.Add ("Value")
            .ColumnAutoResize = .t.
            With .Items
                .DefaultItem = .AddItem("Item 1")
                h = .DefaultItem
                .CellCaption(0, 1) = "Item 1.2"
                .DefaultItem = .InsertItem(h, , "SubItem 1")
                .CellCaption(0, 1) = "SubItem 1.2"
				.DefaultItem = .InsertItem(h, , "SubItem 2")
                .CellCaption(0, 1) = "SubItem 2.2"
                .DefaultItem = h
                .ExpandItem(0) = .t.
            EndWith
            .EndUpdate
        EndWith
    EndWith
EndWith