How to customize the context menu support in the WinForms SyntaxEditor (EditControl)?

//Add an event handler that is called each time the menu is dropped down where you can add custom menu items.
this.editControl1.MenuFill += new EventHandler(cm_FillMenu);
private void cm_FillMenu(object sender, EventArgs e)
{
    ContextMenuManager cm = (ContextMenuManager) sender;
    // Add a separator
    cm.AddSeparator();
    // Add custom custom context menu items and their Click eventhandlers
    cm.AddMenuItem("&Find", new EventHandler(ShowFindDialog));
    cm.AddMenuItem("&Replace", new EventHandler(ShowReplaceDialog));
    cm.AddMenuItem("&Goto", new EventHandler(ShowGoToDialog));
}
void ShowFindDialog(object sender, EventArgs e)
{
    this.editControl1.FindDialog();
}
void ShowReplaceDialog(object sender, EventArgs e)
{
    this.editControl1.ReplaceDialog();
}
void ShowGoToDialog(object sender, EventArgs e)
{
    this.editControl1.GoToDialog();
}

'Add an event handler that is called each time the menu is dropped down where you can add custom menu items.
AddHandler Me.editControl1.MenuFill, AddressOf cm_FillMenu
Private Sub cm_FillMenu(sender As Object, e As EventArgs)
    Dim cm As ContextMenuManager = CType(sender, ContextMenuManager)
    ' Add a separator
    cm.AddSeparator()
    ' Add custom custom context menu items and their Click eventhandlers
    cm.AddMenuItem("&Find", New EventHandler(AddressOf ShowFindDialog))
    cm.AddMenuItem("&Replace", New EventHandler(AddressOf ShowReplaceDialog))
    cm.AddMenuItem("&Goto", New EventHandler(AddressOf ShowGoToDialog))
Sub ShowFindDialog(sender As Object, e As EventArgs)
    Me.editControl1.FindDialog()
End Sub
Sub ShowReplaceDialog(sender As Object, e As EventArgs)
    Me.editControl1.ReplaceDialog()
End Sub
Sub ShowGoToDialog(sender As Object, e As EventArgs)
    Me.editControl1.GoToDialog()
End Sub