Opening exe inside vb.net form

[ehead13]

Hi,
I'm having a little trouble when trying to open executables and set them in a panel in my form.

Currently I have:

Imports System.Diagnostics.Process
Imports System.Runtime.InteropServices
 
Public Class Form1
    Declare Auto Function SetParent Lib "user32.dll" (ByVal hWndChild As IntPtr, ByVal hWndNewParent As IntPtr) As Integer
    Declare Auto Function SendMessage Lib "user32.dll" (ByVal hWnd As IntPtr, ByVal Msg As Integer, ByVal wParam As Integer, ByVal lParam As Integer) As Integer
    Private Const WM_SYSCOMMAND As Integer = 274
    Private Const SC_MAXIMIZE As Integer = 61488
    Private proc As Process = New Process()
 
Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
    proc = Process.Start("notepad.exe")
    proc.WaitForInputIdle()
    SetParent(proc.MainWindowHandle, Panel1.Handle)
    SendMessage(proc.MainWindowHandle, WM_SYSCOMMAND, SC_MAXIMIZE, 0)
    End Sub
 
End Class

what throws me is that the code works when i use "notepad.exe" but no other executable say mspaint or another windows an help will be appriciated!