The SelectItem event notifies your application once the user clicks/selects an item. The ID property specifies the item's identifier. In C++ or VFP, you can use the Notifier to get notified through the WM_COMMAND message.

private void SelectItem(object sender,exontrol.EXRIBBONLib.Item Itm)
{
}

Private Sub SelectItem(ByVal sender As System.Object,ByVal Itm As exontrol.EXRIBBONLib.Item) Handles SelectItem
End Sub

private void SelectItem(object sender, AxEXRIBBONLib._IRibbonEvents_SelectItemEvent e)
{
}

void OnSelectItem(LPDISPATCH Itm)
{
}

void __fastcall SelectItem(TObject *Sender,Exribbonlib_tlb::IItem *Itm)
{
}

procedure SelectItem(ASender: TObject; Itm : IItem);
begin
end;

procedure SelectItem(sender: System.Object; e: AxEXRIBBONLib._IRibbonEvents_SelectItemEvent);
begin
end;

begin event SelectItem(oleobject Itm)
end event SelectItem

Private Sub SelectItem(ByVal sender As System.Object, ByVal e As AxEXRIBBONLib._IRibbonEvents_SelectItemEvent) Handles SelectItem
End Sub

Private Sub SelectItem(ByVal Itm As EXRIBBONLibCtl.IItem)
End Sub

Private Sub SelectItem(ByVal Itm As Object)
End Sub

LPARAMETERS Itm

PROCEDURE OnSelectItem(oRibbon,Itm)
RETURN

<SCRIPT EVENT="SelectItem(Itm)" LANGUAGE="JScript">
</SCRIPT>

<SCRIPT LANGUAGE="VBScript">
Function SelectItem(Itm)
End Function
</SCRIPT>

Procedure OnComSelectItem Variant llItm
	Forward Send OnComSelectItem llItm
End_Procedure

METHOD OCX_SelectItem(Itm) CLASS MainDialog
RETURN NIL

void onEvent_SelectItem(COM _Itm)
{
}

function SelectItem as v (Itm as OLE::Exontrol.Ribbon.1::IItem)
end function

function nativeObject_SelectItem(Itm)
return

The following samples show how you can get notified once the user clicks the item:

VBA (MS Access, Excell...)

' SelectItem event - Occurs when the user selects the item.
Private Sub Ribbon1_SelectItem(ByVal Itm As Object)
	With Ribbon1
		Debug.Print( "SelectItem event on Itm object" )
	End With
End Sub

With Ribbon1
	With .Items
		.Add "Item"
		.Add "Item"
	End With
	.Refresh 
End With

VB6

' SelectItem event - Occurs when the user selects the item.
Private Sub Ribbon1_SelectItem(ByVal Itm As EXRIBBONLibCtl.IItem)
	With Ribbon1
		Debug.Print( "SelectItem event on Itm object" )
	End With
End Sub

With Ribbon1
	With .Items
		.Add "Item"
		.Add "Item"
	End With
	.Refresh 
End With

VB.NET

' SelectItem event - Occurs when the user selects the item.
Private Sub Exribbon1_SelectItem(ByVal sender As System.Object,ByVal Itm As exontrol.EXRIBBONLib.Item) Handles Exribbon1.SelectItem
	With Exribbon1
		Debug.Print( "SelectItem event on Itm object" )
	End With
End Sub

With Exribbon1
	With .Items
		.Add("Item")
		.Add("Item")
	End With
	.Refresh()
End With

VB.NET for /COM

' SelectItem event - Occurs when the user selects the item.
Private Sub AxRibbon1_SelectItem(ByVal sender As System.Object, ByVal e As AxEXRIBBONLib._IRibbonEvents_SelectItemEvent) Handles AxRibbon1.SelectItem
	With AxRibbon1
		Debug.Print( "SelectItem event on Itm object" )
	End With
End Sub

With AxRibbon1
	With .Items
		.Add("Item")
		.Add("Item")
	End With
	.Refresh()
End With

C++

// SelectItem event - Occurs when the user selects the item.
void OnSelectItemRibbon1(LPDISPATCH Itm)
{
	/*
		Copy and paste the following directives to your header file as
		it defines the namespace 'EXRIBBONLib' for the library: 'ExRibbon 1.0 Control Library'
		#import <ExRibbon.dll>
		using namespace EXRIBBONLib;
	*/
	EXRIBBONLib::IRibbonPtr spRibbon1 = GetDlgItem(IDC_RIBBON1)->GetControlUnknown();
	OutputDebugStringW( L"SelectItem event on Itm object" );
}

EXRIBBONLib::IRibbonPtr spRibbon1 = GetDlgItem(IDC_RIBBON1)->GetControlUnknown();
EXRIBBONLib::IItemsPtr var_Items = spRibbon1->GetItems();
	var_Items->Add(L"Item",vtMissing,vtMissing);
	var_Items->Add(L"Item",vtMissing,vtMissing);
spRibbon1->Refresh();

C++ Builder

// SelectItem event - Occurs when the user selects the item.
void __fastcall TForm1::Ribbon1SelectItem(TObject *Sender,Exribbonlib_tlb::IItem *Itm)
{
	OutputDebugString( L"SelectItem event on Itm object" );
}

Exribbonlib_tlb::IItemsPtr var_Items = Ribbon1->Items;
	var_Items->Add(L"Item",TNoParam(),TNoParam());
	var_Items->Add(L"Item",TNoParam(),TNoParam());
Ribbon1->Refresh();

C#

// SelectItem event - Occurs when the user selects the item.
private void exribbon1_SelectItem(object sender,exontrol.EXRIBBONLib.Item Itm)
{
	System.Diagnostics.Debug.Print( "SelectItem event on Itm object" );
}
//this.exribbon1.SelectItem += new exontrol.EXRIBBONLib.exg2antt.SelectItemEventHandler(this.exribbon1_SelectItem);

exontrol.EXRIBBONLib.Items var_Items = exribbon1.Items;
	var_Items.Add("Item",null,null);
	var_Items.Add("Item",null,null);
exribbon1.Refresh();

JScript/JavaScript

<BODY onload='Init()'>
<SCRIPT FOR="Ribbon1" EVENT="SelectItem(Itm)" LANGUAGE="JScript">
	alert( "SelectItem event on Itm object" );
</SCRIPT>

<OBJECT CLASSID="clsid:DDF58CFA-750F-45E0-8A00-CFBE431702E2" id="Ribbon1"></OBJECT>

<SCRIPT LANGUAGE="JScript">
function Init()
{
	var var_Items = Ribbon1.Items;
		var_Items.Add("Item",null,null);
		var_Items.Add("Item",null,null);
	Ribbon1.Refresh();
}
</SCRIPT>
</BODY>

VBScript

<BODY onload='Init()'>
<SCRIPT LANGUAGE="VBScript">
Function Ribbon1_SelectItem(Itm)
	With Ribbon1
		alert( "SelectItem event on Itm object" )
	End With
End Function
</SCRIPT>

<OBJECT CLASSID="clsid:DDF58CFA-750F-45E0-8A00-CFBE431702E2" id="Ribbon1"></OBJECT>

<SCRIPT LANGUAGE="VBScript">
Function Init()
	With Ribbon1
		With .Items
			.Add "Item"
			.Add "Item"
		End With
		.Refresh 
	End With
End Function
</SCRIPT>
</BODY>

C# for /COM

// SelectItem event - Occurs when the user selects the item.
private void axRibbon1_SelectItem(object sender, AxEXRIBBONLib._IRibbonEvents_SelectItemEvent e)
{
	System.Diagnostics.Debug.Print( "SelectItem event on Itm object" );
}
//this.axRibbon1.SelectItem += new AxEXRIBBONLib._IRibbonEvents_SelectItemEventHandler(this.axRibbon1_SelectItem);

EXRIBBONLib.Items var_Items = axRibbon1.Items;
	var_Items.Add("Item",null,null);
	var_Items.Add("Item",null,null);
axRibbon1.Refresh();

X++ (Dynamics Ax 2009)

// SelectItem event - Occurs when the user selects the item.
void onEvent_SelectItem(COM _Itm)
{
	;
	print( "SelectItem event on Itm object" );
}

public void init()
{
	COM com_Items;
	anytype var_Items;
	;

	super();

	var_Items = exribbon1.Items(); com_Items = var_Items;
		com_Items.Add("Item");
		com_Items.Add("Item");
	exribbon1.Refresh();
}

Delphi 8 (.NET only)

// SelectItem event - Occurs when the user selects the item.
procedure TWinForm1.AxRibbon1_SelectItem(sender: System.Object; e: AxEXRIBBONLib._IRibbonEvents_SelectItemEvent);
begin
	with AxRibbon1 do
	begin
		OutputDebugString( 'SelectItem event on Itm object' );
	end
end;

with AxRibbon1 do
begin
	with Items do
	begin
		Add('Item',Nil,Nil);
		Add('Item',Nil,Nil);
	end;
	Refresh();
end

Delphi (standard)

// SelectItem event - Occurs when the user selects the item.
procedure TForm1.Ribbon1SelectItem(ASender: TObject; Itm : IItem);
begin
	with Ribbon1 do
	begin
		OutputDebugString( 'SelectItem event on Itm object' );
	end
end;

with Ribbon1 do
begin
	with Items do
	begin
		Add('Item',Null,Null);
		Add('Item',Null,Null);
	end;
	Refresh();
end

VFP

*** SelectItem event - Occurs when the user selects the item. ***
LPARAMETERS Itm
	with thisform.Ribbon1
		DEBUGOUT( "SelectItem event on Itm object" )
	endwith

with thisform.Ribbon1
	with .Items
		.Add("Item")
		.Add("Item")
	endwith
	.Refresh
endwith

dBASE Plus

/*
with (this.ACTIVEX1.nativeObject)
	SelectItem = class::nativeObject_SelectItem
endwith
*/
// Occurs when the user selects the item.
function nativeObject_SelectItem(Itm)
	local oRibbon
	oRibbon = form.Activex1.nativeObject
	? "SelectItem event on Itm object" 
return

local oRibbon,var_Items

oRibbon = form.Activex1.nativeObject
var_Items = oRibbon.Items
	var_Items.Add("Item")
	var_Items.Add("Item")
oRibbon.Refresh()

XBasic (Alpha Five)

' Occurs when the user selects the item.
function SelectItem as v (Itm as OLE::Exontrol.Ribbon.1::IItem)
	Dim oRibbon as P
	oRibbon = topparent:CONTROL_ACTIVEX1.activex
	? "SelectItem event on Itm object" 
end function

Dim oRibbon as P
Dim var_Items as P

oRibbon = topparent:CONTROL_ACTIVEX1.activex
var_Items = oRibbon.Items
	var_Items.Add("Item")
	var_Items.Add("Item")
oRibbon.Refresh()

Visual Objects

METHOD OCX_Exontrol1SelectItem(Itm) CLASS MainDialog
	// SelectItem event - Occurs when the user selects the item.
	OutputDebugString(String2Psz( "SelectItem event on Itm object" ))
RETURN NIL

local var_Items as IItems

var_Items := oDCOCX_Exontrol1:Items
	var_Items:Add("Item",nil,nil)
	var_Items:Add("Item",nil,nil)
oDCOCX_Exontrol1:Refresh()

PowerBuilder

/*begin event SelectItem(oleobject Itm) - Occurs when the user selects the item.*/
/*
	OleObject oRibbon
	oRibbon = ole_1.Object
	MessageBox("Information",string( "SelectItem event on Itm object" ))
*/
/*end event SelectItem*/

OleObject oRibbon,var_Items

oRibbon = ole_1.Object
var_Items = oRibbon.Items
	var_Items.Add("Item")
	var_Items.Add("Item")
oRibbon.Refresh()

Visual DataFlex

// Occurs when the user selects the item.
Procedure OnComSelectItem Variant llItm
	Forward Send OnComSelectItem llItm
	Showln "SelectItem event on Itm object"
End_Procedure

Procedure OnCreate
	Forward Send OnCreate
	Variant voItems
	Get ComItems to voItems
	Handle hoItems
	Get Create (RefClass(cComItems)) to hoItems
	Set pvComObject of hoItems to voItems
		Get ComAdd of hoItems "Item" Nothing Nothing to Nothing
		Get ComAdd of hoItems "Item" Nothing Nothing to Nothing
	Send Destroy to hoItems
	Send ComRefresh
End_Procedure

XBase++

PROCEDURE OnSelectItem(oRibbon,Itm)
	DevOut( "SelectItem event on Itm object" )
RETURN

#include "AppEvent.ch"
#include "ActiveX.ch"

PROCEDURE Main
 	LOCAL oForm
	LOCAL nEvent := 0, mp1 := NIL, mp2 := NIL, oXbp := NIL
	LOCAL oItems
	LOCAL oRibbon

	oForm := XbpDialog():new( AppDesktop() )
	oForm:drawingArea:clipChildren := .T.
	oForm:create( ,,{100,100}, {640,480},, .F. )
	oForm:close  := {|| PostAppEvent( xbeP_Quit )}

	oRibbon := XbpActiveXControl():new( oForm:drawingArea )
	oRibbon:CLSID  := "Exontrol.Ribbon.1" /*{DDF58CFA-750F-45E0-8A00-CFBE431702E2}*/
	oRibbon:create(,, {10,60},{610,370} )

		oRibbon:SelectItem := {|Itm| OnSelectItem(oRibbon,Itm)} /*Occurs when the user selects the item.*/

		oItems := oRibbon:Items()
			oItems:Add("Item")
			oItems:Add("Item")
		oRibbon:Refresh()

	oForm:Show()
	DO WHILE nEvent != xbeP_Quit
		nEvent := AppEvent( @mp1, @mp2, @oXbp )
		oXbp:handleEvent( nEvent, mp1, mp2 )
	ENDDO 
RETURN