求助：MO+VB，在trackinglayer上使用addevent绘图后删除的问题

<P>    Dim Lyr1 As MapObjects2.TrackingLayer<BR>    Set Lyr1 = Map1.TrackingLayer<BR>    <BR>    Dim Line1 As MapObjects2.Line<BR>    Set Line1 = Map1.TrackLine<BR>    Lyr1.AddEvent Line1, moSolidLine</P>
<P>然后使用什么代码可以在Map1上删除Line1?</P>