Use a MouseDown or MouseUp event procedure to specify actions that will occur when a mouse button is pressed or released. Unlike the Click and DblClick events, MouseDown and MouseUp events lets you distinguish between the left, right, and middle mouse buttons. You can also write code for mouse-keyboard combinations that use the SHIFT, CTRL, and ALT keyboard modifiers. Use the SelectItem property to get the index of the selected item. Use the SelectGroup property to get the index of the selected group. Use the ItemFromPoint property to get the item over cursor. Use the GroupFromPoint property to get the group over cursor. 

private void MouseDownEvent(object sender,short Button,short Shift,int X,int Y)
{
}

Private Sub MouseDownEvent(ByVal sender As System.Object,ByVal Button As Short,ByVal Shift As Short,ByVal X As Integer,ByVal Y As Integer) Handles MouseDownEvent
End Sub

private void MouseDownEvent(object sender, AxEXLISTBARLib._IListBarEvents_MouseDownEvent e)
{
}

void OnMouseDown(short Button,short Shift,long X,long Y)
{
}

void __fastcall MouseDown(TObject *Sender,short Button,short Shift,int X,int Y)
{
}

procedure MouseDown(ASender: TObject; Button : Smallint;Shift : Smallint;X : Integer;Y : Integer);
begin
end;

procedure MouseDownEvent(sender: System.Object; e: AxEXLISTBARLib._IListBarEvents_MouseDownEvent);
begin
end;

begin event MouseDown(integer Button,integer Shift,long X,long Y)
end event MouseDown

Private Sub MouseDownEvent(ByVal sender As System.Object, ByVal e As AxEXLISTBARLib._IListBarEvents_MouseDownEvent) Handles MouseDownEvent
End Sub

Private Sub MouseDown(Button As Integer,Shift As Integer,X As Single,Y As Single)
End Sub

Private Sub MouseDown(ByVal Button As Integer,ByVal Shift As Integer,ByVal X As Long,ByVal Y As Long)
End Sub

LPARAMETERS Button,Shift,X,Y

PROCEDURE OnMouseDown(oListBar,Button,Shift,X,Y)
RETURN

<SCRIPT EVENT="MouseDown(Button,Shift,X,Y)" LANGUAGE="JScript">
</SCRIPT>

<SCRIPT LANGUAGE="VBScript">
Function MouseDown(Button,Shift,X,Y)
End Function
</SCRIPT>

Procedure OnComMouseDown Short llButton Short llShift OLE_XPOS_PIXELS llX OLE_YPOS_PIXELS llY
	Forward Send OnComMouseDown llButton llShift llX llY
End_Procedure

METHOD OCX_MouseDown(Button,Shift,X,Y) CLASS MainDialog
RETURN NIL

void onEvent_MouseDown(int _Button,int _Shift,int _X,int _Y)
{
}

function MouseDown as v (Button as N,Shift as N,X as OLE::Exontrol.ListBar.1::OLE_XPOS_PIXELS,Y as OLE::Exontrol.ListBar.1::OLE_YPOS_PIXELS)
end function

function nativeObject_MouseDown(Button,Shift,X,Y)
return

The following VB sample displays the caption of the group being clicked:

Private Sub ListBar1_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
    With ListBar1
        Dim g As Group
        Set g = .GroupFromPoint(X / Screen.TwipsPerPixelX, Y / Screen.TwipsPerPixelY)
        If Not g Is Nothing Then
            MsgBox g.Caption
        End If
    End With
End Sub

The following VB sample displays the caption of the item being clicked:

Private Sub ListBar1_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
    With ListBar1
        Dim i As Item
        Set i = .ItemFromPoint(X / Screen.TwipsPerPixelX, Y / Screen.TwipsPerPixelY)
        If Not i Is Nothing Then
            MsgBox i.Caption
        End If
    End With
End Sub

The following C++ sample displays the caption of the group being clicked:

void OnMouseDownListbar1(short Button, short Shift, long X, long Y) 
{
	CGroup group = m_listbar.GetGroupFromPoint( X, Y );
	if ( group.m_lpDispatch != NULL )
		MessageBox( group.GetCaption() );
}

The following C++ sample displays the caption of the item being clicked:

void OnMouseDownListbar1(short Button, short Shift, long X, long Y) 
{
	CItem item = m_listbar.GetItemFromPoint( X, Y );
	if ( item.m_lpDispatch != NULL )
		MessageBox( item.GetCaption() );
}

The following VB.NET sample displays the caption of the group being clicked:

Private Sub AxListBar1_MouseDownEvent(ByVal sender As Object, ByVal e As AxEXLISTBARLib._IListBarEvents_MouseDownEvent) Handles AxListBar1.MouseDownEvent
    With AxListBar1
        Dim g As EXLISTBARLib.Group = .get_GroupFromPoint(e.x, e.y)
        If Not g Is Nothing Then
            MsgBox(g.Caption)
        End If
    End With
End Sub

The following VB.NET sample displays the caption of the item being clicked:

Private Sub AxListBar1_MouseDownEvent(ByVal sender As Object, ByVal e As AxEXLISTBARLib._IListBarEvents_MouseDownEvent) Handles AxListBar1.MouseDownEvent
    With AxListBar1
        Dim i As EXLISTBARLib.Item = .get_ItemFromPoint(e.x, e.y)
        If Not i Is Nothing Then
            MsgBox(i.Caption)
        End If
    End With
End Sub

The following C# sample displays the caption of the group being clicked:

private void axListBar1_MouseDownEvent(object sender, AxEXLISTBARLib._IListBarEvents_MouseDownEvent e)
{
	EXLISTBARLib.Group g = axListBar1.get_GroupFromPoint(e.x, e.y);
	if (g != null)
		MessageBox.Show(g.Caption);
}

The following C# sample displays the caption of the item being clicked:

private void axListBar1_MouseDownEvent(object sender, AxEXLISTBARLib._IListBarEvents_MouseDownEvent e)
{
	EXLISTBARLib.Item i = axListBar1.get_ItemFromPoint(e.x, e.y);
	if (i != null)
		MessageBox.Show(i.Caption);
}

The following VFP sample displays the caption of the group being clicked:

*** ActiveX Control Event ***
LPARAMETERS button, shift, x, y

With thisform.ListBar1
    local g
    g = .GroupFromPoint(x , y)
    If !isnull(g)
		with g
	        wait window nowait .Caption
       endwith
    EndIf
EndWith

The following VFP sample displays the caption of the item being clicked:

*** ActiveX Control Event ***
LPARAMETERS button, shift, x, y

With thisform.ListBar1
    local i
    i = .ItemFromPoint(x , y)
    If !isnull(i)
		with i
	        wait window nowait .Caption
       endwith
    EndIf
EndWith