The Popup form uses the following code to position itself in the upper right, upper middle, lower left, etc. part of its parent form.

Private Sub SetupValues(ByVal location As String, _
 ByVal parent As Form, _
 ByVal lastLocation As Point, _
 ByVal lastSize As Size)
    Dim x, y, width, clientWidth, height, clientHeight, _
        border, titleHeight As Integer
    With parent
        With .Location
            x = .X
            y = .Y
        End With
        With .ClientSize
            clientWidth = .Width
            clientHeight = .Height
        End With
        With .Size
            width = .Width
            height = .Height
        End With
        border = Math.Abs((width - clientWidth) \ 2)
        titleHeight = height - clientHeight - border
    End With
    Dim point As New Point(x, y)
    point.X += border
    point.Y += titleHeight
    Dim size As Size

    Me.StartPosition = FormStartPosition.Manual
    If lastLocation.Equals(point.Empty) Then
        Select Case location.Trim.ToLower
            Case "ul"
                ' Do nothing
            Case "ml"
                point.Y += ((clientHeight - Me.Height) \ 2)
            Case "ll"
                point.Y += (clientHeight - Me.Height)
            Case "um"
                point.X += ((clientWidth - Me.Width) \ 2)
            Case "mm"
                point.X += ((clientWidth - Me.Width) \ 2)
                point.Y += ((clientHeight - Me.Height) \ 2)
            Case "lm"
                point.X += ((clientWidth - Me.Width) \ 2)
                point.Y += (clientHeight - Me.Height)
            Case "ur"
                point.X += (clientWidth - Me.Width)
            Case "mr"
                point.X += (clientWidth - Me.Width)
                point.Y += ((clientHeight - Me.Height) \ 2)
            Case "lr"
                point.X += (clientWidth - Me.Width)
                point.Y += (clientHeight - Me.Height)
        End Select
        size = New Size(300, 300)
    Else
        point = lastLocation
        size = lastSize
    End If
    Me.Location = point
    Me.Size = size
End Sub 'SetupValues