关于Arcengine for .net 的一些问题

Question

一、在图层上加点时，不能修改其样式esriSimpleMarkerStyle.esriSMSSquare，运行时看到点的样式都是esriSMSCircle。代码如下：
IMarkerElement pMarkerElement;
IMarkerSymbol pMarkerSymbol;

ISimpleMarkerSymbol pSimpleMarkerSymbol = new SimpleMarkerSymbolClass();

pSimpleMarkerSymbol.Style = esriSimpleMarkerStyle.esriSMSSquare;
pSimpleMarkerSymbol.Size = 10;
pSimpleMarkerSymbol.Outline = true;
pSimpleMarkerSymbol.OutlineSize = 4;

pRGBColor.Red = 212;
pRGBColor.Green = 212;
pRGBColor.Blue = 212;
pSimpleMarkerSymbol.OutlineColor = pRGBColor;

pMarkerSymbol = pSimpleMarkerSymbol as IMarkerSymbol;
//pMarkerSymbol.Size = 20;

//pMarkerSymbol.Color = pRGBColor;

//点
IElement pElement = new MarkerElementClass();
pElement.Geometry = point as IGeometry;
pMarkerElement = pElement as IMarkerElement;
pMarkerElement.Symbol = pMarkerSymbol;

IGraphicsContainer3D pGC3D = tempLayer as IGraphicsContainer3D;
pGC3D.AddElements(pElement);

二、加载地图后，关掉子窗口，再重新打开子窗口，原来地图上的文字(ITextElement)变成方块了。

三、鼠标滚轮缩放地图事件可否直接加到axGlobeControl控件上？现在是加到窗体上的，每次需要窗体获得焦点，而axGlobeControl控件失去焦点才能缩放。
四、每次加载地图的时候，都要绘制点、文字的集合，导致加载的过程消耗时间长。不知道有没有提升性能的方法呢？
五、绘制点时，其Symbol选用CharacterMarkerSymbol，但也没有显示出字符来，还是显示的是圆的样式。代码如下：
IMarkerElement pMarkerElement;
IMarkerSymbol pMarkerSymbol;

ICharacterMarkerSymbol pCharacterSymbol = new CharacterMarkerSymbol();

stdole.IFontDisp pFont = new stdole.StdFont() as stdole.IFontDisp;
pFont.Name = "ESRI Default Marker";
pFont.Size = 20;
pCharacterSymbol.Font=pFont;
pCharacterSymbol.CharacterIndex = 34;


pRGBColor.Red = 212;
pRGBColor.Green = 212;
pRGBColor.Blue = 212;
pCharacterSymbol.Color = pRGBColor;

pMarkerSymbol = pCharacterSymbol as IMarkerSymbol;


//点
IElement pElement = new MarkerElementClass();
pElement.Geometry = point as IGeometry;
pMarkerElement = pElement as IMarkerElement;
pMarkerElement.Symbol = pMarkerSymbol;


IGraphicsContainer3D pGC3D = tempLayer as IGraphicsContainer3D;
pGC3D.AddElements(pElement);