cad二次开发不用选择直接设定填充图案

采用c#CAD二次开发，怎么添加填充，且不用用户先选择填充图案，而之直接给他设定图案，那位大神指点迷津下

先在cad录制一个宏。然后再在你的代码中照着写就可以了。

试过了不知道怎么看宏代码，和word等office不一样，另外cad没有给接口，是通过P/Invoke技术实现，也试过了但老是出现无法找到入口点
using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.EditorInput;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.ApplicationServices;
using System.Reflection;
using System.Runtime.InteropServices;

namespace HatchDialogTest
{
public class Commands
{
** [DllImport(
"acad.exe",
EntryPoint =
"?acedHatchPalletteDialog@@YA_NPB_W_NAAPA_W@Z",
CharSet = CharSet.Auto
)
]**
static extern bool acedHatchPalletteDialog(
string currentPattern,
bool showcustom,
out string newpattern
);

[CommandMethod("SHD")]
static public void ShowHatchDialog()
{
  string sHatchType;
  string sNewHatchType;
  bool bRet;
  sHatchType = "ANGLE";
  bRet =
    acedHatchPalletteDialog(
      sHatchType,
      true,
      out sNewHatchType
    );
  if (bRet)
  {
    Editor ed =
      Application.DocumentManager.MdiActiveDocument.Editor;
    ed.WriteMessage(
      "\nHatch type selected: " + sNewHatchType
    );
  }
}

}
}
Here's what happens when you run the code:

Command: SHD

Hatch_dialog

D应该是llImport后面的问题但又不知道怎么改，
代码参照Kean Walmsley的代码，源代码http://through-the-interface.typepad.com/through_the_interface/2007/03/showing_autocad.html