How do I make a window modal that was opened using Shell Execute.

[RealisticGraphics]

How do I make a window modal that was opened using Shell Execute? I'm using the following code that I found on VB-World to display a property box for files, but I would like the property window to be modal when it opens up or at least cancel the window when it losses focus. The flag may already be listed in the code and I'm just missing it. Thanks:

Public Const SEE_MASK_INVOKEIDLIST = &HC
Public Const SEE_MASK_NOCLOSEPROCESS = &H40
Public Const SEE_MASK_FLAG_NO_UI = &H400

Declare Function ShellExecuteEX Lib "shell32.dll" Alias "ShellExecuteEx" (SEI As SHELLEXECUTEINFO) As Long

Type SHELLEXECUTEINFO
    cbSize As Long
    fMask As Long
    hwnd As Long
    lpVerb As String
    lpFile As String
    lpParameters As String
    lpDirectory As String
    nShow As Long
    hInstApp As Long
    lpIDList As Long
    lpClass As String
    hkeyClass As Long
    dwHotKey As Long
    hIcon As Long
    hProcess As Long
End Type

Public Sub ShowProps(FileName As String, OwnerhWnd As Long)

    Dim SEI As SHELLEXECUTEINFO
    Dim r As Long
     
    With SEI
        .cbSize = Len(SEI)
        .fMask = SEE_MASK_NOCLOSEPROCESS Or _
         SEE_MASK_INVOKEIDLIST Or SEE_MASK_FLAG_NO_UI
        .hwnd = OwnerhWnd
        .lpVerb = "properties"
        .lpFile = FileName
        .lpParameters = vbNullChar
        .lpDirectory = vbNullChar
        .nShow = 0
        .hInstApp = 0
        .lpIDList = 0
    End With
     
    r = ShellExecuteEX(SEI)
End Sub