Public Class Form2
 
    Protected Overrides ReadOnly Property ShowWithoutActivation() As Boolean
        Get
            Return True
        End Get
    End Property
 
End Class

Public Class Form1
 
    Dim oForm As New Form2
 
    Private Sub PictureBox1_MouseHover(ByVal sender As System.Object, ByVal e _
      As System.EventArgs) Handles PictureBox1.MouseHover
        Dim p As Point = Cursor.Position
        oForm.StartPosition = FormStartPosition.Manual
        oForm.Location = p
        oForm.ShowDialog()
    End Sub
 
    Private Sub PictureBox1_MouseLeave(ByVal sender As System.Object, ByVal e _
      As System.EventArgs) Handles PictureBox1.MouseLeave
        oForm.Close()
    End Sub
 
End Class