ToolStripDropDown.Closing Event

' This method handles the Closing event. The ToolStripDropDown 
' control is not allowed to close unless the Done menu item 
' is clicked or the Close method is called explicitly. 
' The Done menu item is enabled only after both of the other 
' menu items have been selected. 
Private Sub contextMenuStrip_Closing(sender As Object, e As ToolStripDropDownClosingEventArgs) Handles contextMenuStrip1.Closing
   If e.CloseReason <> ToolStripDropDownCloseReason.CloseCalled Then 
      If subItem1ToolStripMenuItem.Checked AndAlso subItem2ToolStripMenuItem.Checked AndAlso doneToolStripMenuItem.Enabled Then 
         ' Reset the state of menu items.
         subItem1ToolStripMenuItem.Checked = False
         subItem2ToolStripMenuItem.Checked = False
         doneToolStripMenuItem.Enabled = False 

         ' Allow the ToolStripDropDown to close. 
         ' Don't cancel the Close operation.
         e.Cancel = False 
      Else 
         ' Cancel the Close operation to keep the menu open.
         e.Cancel = True 
         Me.toolStripStatusLabel1.Text = "Close canceled" 
      End If 
   End If 
 End Sub