急：用CW3DGraphLib__DCWGraph3DPlot3DCurve 怎么 画多条曲线？

打算用CVI/labwindows2013 调用cw3dgrph控件，画二条空间线，结果只能成功画一条，有哪位高手用过该指令，指点一下？
在NI官方网站见过类似求助，思路感觉相同，但就是不成功，哪位大牛指点一下？
附NI贴
/* here you draw the first plot /
CW3DGraphLib_CWPlots3DItem (plotsHandle, NULL, CA_VariantInt(1), &plotHandle);
CW3DGraphLib_CWPlot3DSetMultiPlot (plotHandle, NULL, VTRUE);
CW3DGraphLib_CWPlots3DItem (plotsHandle, NULL, CA_VariantInt(2), &plotHandle);
CW3DGraphLib_CWPlot3DSetMultiPlot (plotHandle, NULL, VFALSE);
CW3DGraphLib_CWPlots3DItem (plotsHandle, NULL, CA_VariantInt(3), &plotHandle);
CW3DGraphLib_CWPlot3DSetMultiPlot (plotHandle, NULL, VFALSE);
CW3DGraphLib_CWPlot3DPlot3DSurface (plotHandle, NULL, xArray1, yArray1, dArray1, CA_DEFAULT_VAL);
/ here you draw the second plot /
CW3DGraphLib_CWPlots3DItem (plotsHandle, NULL, CA_VariantInt(1), &plotHandle);
CW3DGraphLib_CWPlot3DSetMultiPlot (plotHandle, NULL, VFALSE);
CW3DGraphLib_CWPlots3DItem (plotsHandle, NULL, CA_VariantInt(2), &plotHandle);
CW3DGraphLib_CWPlot3DSetMultiPlot (plotHandle, NULL, VTRUE);
CW3DGraphLib_CWPlots3DItem (plotsHandle, NULL, CA_VariantInt(3), &plotHandle);
CW3DGraphLib_CWPlot3DSetMultiPlot (plotHandle, NULL, VFALSE);
CW3DGraphLib_CWPlot3DPlot3DSurface (plotHandle, NULL, xArray2, yArray2, dArray2, CA_DEFAULT_VAL);
/ here you draw the first plot */
CW3DGraphLib_CWPlots3DItem (plotsHandle, NULL, CA_VariantInt(1), &plotHandle);
CW3DGraphLib_CWPlot3DSetMultiPlot (plotHandle, NULL, VFALSE);
CW3DGraphLib_CWPlots3DItem (plotsHandle, NULL, CA_VariantInt(2), &plotHandle);
CW3DGraphLib_CWPlot3DSetMultiPlot (plotHandle, NULL, VFALSE);
CW3DGraphLib_CWPlots3DItem (plotsHandle, NULL, CA_VariantInt(3), &plotHandle);
CW3DGraphLib_CWPlot3DSetMultiPlot (plotHandle, NULL, VTRUE);
CW3DGraphLib_CWPlot3DPlot3DSurface (plotHandle, NULL, xArray3, yArray3, dArray3, CA_DEFAULT_VAL);

  CW3DGraphLib__DCWGraph3DGetPlots (Graph3D_Handle, NULL, &plotsHandle);          //ok  

    int hhh;
    CW3DGraphLib_CWPlots3DAdd (plotsHandle, NULL, &hhh); 
    CW3DGraphLib_CWPlots3DItem (plotsHandle, NULL, CA_VariantInt(1), &plotHandle);
    //CW3DGraphLib_CWPlot3DSetMultiPlot (plotHandle, NULL, VFALSE);
      CW3DGraphLib_CWPlot3DPlot3DCurve (plotHandle, NULL,XV,YV,ZV,CV);    

    CW3DGraphLib_CWPlots3DItem (plotsHandle, NULL, CA_VariantInt(2), &plotHandle);
        //   CW3DGraphLib_CWPlot3DSetMultiPlot (plotHandle, NULL, VFALSE);
     CW3DGraphLib_CWPlot3DPlot3DCurve (plotHandle, NULL,XV1,YV1,ZV1,CV1);