Set the NOTIFYICON Type hIcon Property to the Image you want to Display in the Tray, then Call the Shell_NotifyIcon Function with the NIM_MODIFY Flag, eg.

On a Form, Add an Invisible Picturebox with an Icon loaded in it and a Timer Control..
Code:
Private Type NOTIFYICONDATA
        cbSize As Long
        hwnd As Long
        uID As Long
        uFlags As Long
        uCallbackMessage As Long
        hIcon As Long
        szTip As String * 64
End Type

Private Declare Function Shell_NotifyIcon Lib "shell32.dll" Alias "Shell_NotifyIconA" (ByVal dwMessage As Long, lpData As NOTIFYICONDATA) As Long

Private Const NIF_ICON = &H2
Private Const NIF_MESSAGE = &H1
Private Const NIF_TIP = &H4
Private Const NIM_ADD = &H0
Private Const NIM_DELETE = &H2
Private Const NIM_MODIFY = &H1
Private Const WM_MOUSEMOVE = &H200
Private Const WM_LBUTTONDBLCLK = &H203
Private Const WM_LBUTTONDOWN = &H201
Private Const WM_RBUTTONDOWN = &H204

Private tTrayIcon As NOTIFYICONDATA

Private Sub Form_Load()
    'Create a Tray Icon
    Picture1.Visible = False
    With tTrayIcon
        .hIcon = Icon
        .hwnd = Picture1.hwnd
        .szTip = "My Tray Icon" & Chr(0)
        .uCallbackMessage = WM_MOUSEMOVE
        .uFlags = NIF_ICON Or NIF_MESSAGE Or NIF_TIP
        .uID = 1
        .cbSize = Len(tTrayIcon)
    End With
    Shell_NotifyIcon NIM_ADD, tTrayIcon
    Timer1.Interval = 1000
    Timer1.Enabled = True
End Sub

Private Sub Form_Resize()
    DoEvents
    If WindowState = vbMinimized Then
        Hide
    End If
End Sub

Private Sub Form_Unload(Cancel As Integer)
    'Remove the Tray Icon
    Timer1.Enabled = False
    Shell_NotifyIcon NIM_DELETE, tTrayIcon
End Sub

Private Sub Picture1_MouseMove(Button As Integer, Shift As Integer, X As Single, Y As Single)
    Select Case ScaleX(X, vbTwips, vbPixels)
    Case WM_RBUTTONDOWN
        'Show Popup Menu
    Case WM_LBUTTONDBLCLK
        'Show the Form
        WindowState = vbNormal
        Show
    End Select
End Sub

Private Sub Timer1_Timer()
    Static bFlash As Boolean
    bFlash = Not bFlash
    If bFlash Then
        tTrayIcon.hIcon = Picture1
    Else
        tTrayIcon.hIcon = Icon
    End If
    tTrayIcon.cbSize = Len(tTrayIcon)
    Shell_NotifyIcon NIM_MODIFY, tTrayIcon
End Sub
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Aaron Young
Analyst Programmer
[email protected]
[email protected]