Show Form Without losing Focus

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VB

I am creating a messenger with a notification(MSN like).

How Can i show a notification windows without losing my focus on my active form?

i tried this

Private Declare Function ShowWindow Lib "user32" (ByVal handle As IntPtr, ByVal nCmdShow As Integer) As Integer

Private Const SW_SHOWNA As Integer = 4

Private Sub ShowForm()
    ShowWindow(Me.Handle, SW_SHOWNA)
End Sub

and this

Protected Overrides ReadOnly Property ShowWithoutActivation() As Boolean
        Get
            Return True
        End Get
End Property

But none of them working.

Everytime a notification windows pop up, i always lost my focus on my active form.

Thanks.