[求助]LineElement颜色改变问题

<P>我在AxMapControl1中画了一个LineElement,然后想要改变其颜色及宽度<BR>使用下列程序码,但是LineElement不会有任何反应,也没有出现错误信息<BR>希望各位前辈可以帮忙一下,谢谢!!</P>
<P>        Dim pGContSelect As ESRI.ArcGIS.Carto.IGraphicsContainerSelect<BR>        Dim pElement As ESRI.ArcGIS.Carto.IElement<BR>        Dim pLineElement As ESRI.ArcGIS.Carto.ILineElement</P>
<P>        pGContSelect = AxMapControl1.ActiveView.GraphicsContainer<BR>        pElement = pGContSelect.SelectedElement(0)</P>
<P>        pLineElement = pElement</P>
<P>        Dim pRGB As ESRI.ArcGIS.Display.IRgbColor<BR>        pRGB = New ESRI.ArcGIS.Display.RgbColor<BR>        pRGB.Red = 200<BR>        pRGB.Blue = 0<BR>        pRGB.Green = 0</P>
<P><BR>        pLineElement.Symbol.Color = pRGB<BR>        pLineElement.Symbol.Width = 20.0<BR>        AxMapControl1.ActiveView.GraphicsContainer.UpdateElement(pLineElement)<BR>        AxMapControl1.ActiveView.Refresh()<BR></P>

<P>定义个iLineElement,再定义个线符号ISimpleLineSymbol </P>
<P>pLineElem.Symbol = LineSymbol</P>
<P>设置LineSymbol的颜色就可以了</P>
<P>    Set pFcolor = New RgbColor<BR>    pFcolor.RGB = RGB(0, 255, 0)</P>
<P>    Set LineSym = New SimpleLineSymbol<BR>    LineSym.Color = pFcolor<BR>    LineSym.Width = 2</P>