First you need an event handler
Private Sub ContextMenuHandler_Click(ByVal sender As Object, ByVal e As System.EventArgs)
' Do something when the user clicks on a node
' Use the sender.tag to determine which menu item was clicked
End Sub
Then you can add the menu items dynamically
' This could be a strip added via form designer
Dim oContextMenu As New ContextMenuStrip
' Add a toolstrip Item
Dim oNewToolStripItem As New ToolStripMenuItem
oNewToolStripItem.Text = "Parent"
oNewToolStripItem.Tag = "1"
AddHandler oNewToolStripItem.Click, AddressOf ContextMenuHandler_Click
oContextMenu.Items.Add(oNewToolStripItem)
' Add a couple of children
Dim oNewToolStripItem2 As New ToolStripMenuItem
oNewToolStripItem2.Text = "Child 1"
oNewToolStripItem2.Tag = "2"
AddHandler oNewToolStripItem2.Click, AddressOf ContextMenuHandler_Click
oNewToolStripItem.DropDownItems.Add(oNewToolStripItem2)
Dim oNewToolStripItem3 As New ToolStripMenuItem
oNewToolStripItem3.Text = "Child 2"
oNewToolStripItem3.Tag = "3"
AddHandler oNewToolStripItem3.Click, AddressOf ContextMenuHandler_Click
oNewToolStripItem.DropDownItems.Add(oNewToolStripItem3)