on error goto solucion
codigo...
codigo...
codigo...
codigo...
codigo...

solucion:
msgbox err.number & ": " & err.description
'aqui hiria el code que vuelve a donde surgio el error pero no me acuerdo como era

Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Long
Private Declare Function ShowWindow Lib "user32" (ByVal hWnd As Long, ByVal nCmdShow As Long) As Long
Const SW_SHOWNORMAL = 1
Const SW_SHOWHIDE = 0

Private Sub Form_Load()
Dim hWnd        As Long
hWnd = FindWindow(vbNullString, "Mi PC")
If hWnd <> 0 Then
    'ShowWindow hWnd, SW_SHOWHIDE  'esto lo oculta
    'ShowWindow hWnd, SW_SHOWNORMAL ' y esto lo muestra
End If
End Sub

Option Explicit

Private objDer As PictureBox
Private hndNotepad As Long
Private Declare Function FindWindow Lib "user32.dll" Alias "FindWindowA" _
    (ByVal lpClassName As String, ByVal lpWindowName As String) As Long

'------------------------------------------------------------------------------
' APIS para incluir las ventanas en un PictureBox
'------------------------------------------------------------------------------

' Para hacer ventanas hijas
Private Declare Function SetParent Lib "user32" _
    (ByVal hWndChild As Long, ByVal hWndNewParent As Long) As Long
'
' Para mostrar una ventana según el handle (hwnd)
' ShowWindow() Commands
Private Enum eShowWindow
    HIDE_eSW = 0&
    SHOWNORMAL_eSW = 1&
    NORMAL_eSW = 1&
    SHOWMINIMIZED_eSW = 2&
    SHOWMAXIMIZED_eSW = 3&
    MAXIMIZE_eSW = 3&
    SHOWNOACTIVATE_eSW = 4&
    SHOW_eSW = 5&
    MINIMIZE_eSW = 6&
    SHOWMINNOACTIVE_eSW = 7&
    SHOWNA_eSW = 8&
    RESTORE_eSW = 9&
    SHOWDEFAULT_eSW = 10&
    MAX_eSW = 10&
End Enum

Private Declare Function ShowWindow Lib "user32" _
    (ByVal hWnd As Long, ByVal nCmdShow As eShowWindow) As Long
'
' Para posicionar una ventana según su hWnd
Private Declare Function MoveWindow Lib "user32" _
    (ByVal hWnd As Long, ByVal x As Long, ByVal y As Long, _
    ByVal nWidth As Long, ByVal nHeight As Long, ByVal bRepaint As Long) As Long
'
' Para saber si una ventana es hija de otra
Private Declare Function IsChild Lib "user32" _
    (ByVal hWndParent As Long, ByVal hWnd As Long) As Long

Private Type POINTAPI
    x As Long
    y As Long
End Type
Private Type RECTAPI
    Left As Long
    Top As Long
    Right As Long
    Bottom As Long
End Type
Private Type WINDOWPLACEMENT
    Length As Long
    Flags As Long
    ShowCmd As Long
    ptMinPosition As POINTAPI
    ptMaxPosition As POINTAPI
    rcNormalPosition As RECTAPI
End Type

Private Declare Function GetWindowPlacement Lib "user32" _
    (ByVal hWnd As Long, ByRef lpwndpl As WINDOWPLACEMENT) As Long

' Mostrar el formulario indicado, dentro de picDock
Private Sub dockForm(ByVal formhWnd As Long, _
                     ByVal picDock As PictureBox, _
                     Optional ByVal ajustar As Boolean = True)
    ' Hacer el formulario indicado, un hijo del picDock
    ' Si Ajustar es True, se ajustará al tamaño del contenedor,
    ' si Ajustar es False, se quedará con el tamaño actual.
    Call SetParent(formhWnd, picDock.hWnd)
    posDockForm formhWnd, picDock, ajustar
    Call ShowWindow(formhWnd, NORMAL_eSW)
End Sub

' Posicionar el formulario indicado dentro de picDock
Private Sub posDockForm(ByVal formhWnd As Long, _
                        ByVal picDock As PictureBox, _
                        Optional ByVal ajustar As Boolean = True)
    ' Posicionar el formulario indicado en las coordenadas del picDock
    ' Si Ajustar es True, se ajustará al tamaño del contenedor,
    ' si Ajustar es False, se quedará con el tamaño actual.
    Dim nWidth As Long, nHeight As Long
    Dim wndPl As WINDOWPLACEMENT
    '
    If ajustar Then
        nWidth = picDock.ScaleWidth \ Screen.TwipsPerPixelX
        nHeight = picDock.ScaleHeight \ Screen.TwipsPerPixelY
    Else
        ' el tamaño del formulario que se va a posicionar
        Call GetWindowPlacement(formhWnd, wndPl)
        With wndPl.rcNormalPosition
            nWidth = .Right - .Left
            nHeight = .Bottom - .Top
        End With
    End If
    Call MoveWindow(formhWnd, 0, 0, nWidth, nHeight, True)
End Sub

Private Sub Command1_Click()

    Call Shell("calc.exe", vbNormalFocus) '<<<Podes cambiar por el programa que quieras vos
    '
    Dim s As String
    
    'hndNotepad = FindWindow(s, "Sin título - Bloc de notas")
    hndNotepad = FindWindow(s, "Calculadora") '<<<<--Titulo de la Ventana
    'si es false se ve el exe tal cual es             LEERRRR
    'si es true se ajusta a la ventana bakan
    dockForm hndNotepad, objDer, False
End Sub



Private Sub Form_Load()
    
    Set objDer = picR
    
End Sub