WinForms application with tray icon

Question

I realized an application that minimize it self in a tray icon, from which you can also show a context menu.

I'm facing some problems:

1. I can't get the Context menu to disappear when I click somewhere else

2. The Context menu doesn't appear exacly near the tray icon (it's the black wrench)

   

3. When I open the Context menu, often a blank taskbar item appears:

   

This is the code of the Form Resize handler and the TrayIcon Click handler:

Private Sub MainForm_Resize(snd As Object, e As EventArgs) Handles Me.Resize
    If WindowState = FormWindowState.Minimized Then
        Me.TrayIcon.Visible = True
        Me.ShowInTaskbar = False
        Me.Hide()
    End If
End Sub

Private Sub TrayIcon_Click(snd As Object, e As EventArgs) Handles TrayIcon.Click
    Dim castedEvent As MouseEventArgs = DirectCast(e, MouseEventArgs)
    If (castedEvent.Button = Windows.Forms.MouseButtons.Left) Then
        Me.Show()
        Me.ShowInTaskbar = True
        Me.TrayIcon.Visible = False
        Me.WindowState = FormWindowState.Normal
    Else
        TrayIconContextMenu.Show(Control.MousePosition)
    End If
End Sub