How to introduce a delay before the WinForms TreeViewAdv's Tooltip or HelpText popups are displayed?

this.treeViewAdv1.ToolTipControl.BeforePopup += new CancelEventHandler (TooltipBeforePopup_EventHandler);
this.treeViewAdv1.HelpTextControl.BeforePopup += new CancelEventHandler (TooltipBeforePopup_EventHandler);
private void TooltipBeforePopup_EventHandler (object sender, CancelEventArgs e)
{
   Thread.Sleep(delay);
}

Me.treeViewAdv1.ToolTipControl.BeforePopup += New CancelEventHandler (TooltipBeforePopup_EventHandler)
Me.treeViewAdv1.HelpTextControl.BeforePopup += New CancelEventHandler (TooltipBeforePopup_EventHandler)
Private Sub TooltipBeforePopup_EventHandler(ByVal sender As Object, ByVal e As CancelEventArgs)
' Introduce any desired delay here
    Thread.Sleep(delay)
End Sub