[求助]非模式窗口

    [CommandMethod("TEST")] 
static public void DrawCircle() 
{ 
ClassLibrary1.TestForm Dg = new ClassLibrary1.TestForm(); 
Application.ShowModelessDialog(Dg); 
if (Dg.DialogResult== System.Windows.Forms.DialogResult.Cancel) 
{ 
ed.WriteMessage("\n"); 
return; 
} 
using (Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument.LockDocument()) 
Editor ed = Application.DocumentManager.MdiActiveDocument.Editor; 
PromptPointOptions p = new PromptPointOptions(""); 
p.Message = "请选取圆心！"; 
PromptPointResult result = ed.GetPoint(p); 
if (result.Status.ToString() == "OK") 
{ 
Point3d centerPoint = result.Value; 
Document acDoc = Application.DocumentManager.MdiActiveDocument; 
Database acCurDb = acDoc.Database; 
using (Transaction acTrans = acDoc.TransactionManager.StartTransaction()) 
{ 
BlockTable acTab = acTrans.GetObject(acCurDb.BlockTableId, OpenMode.ForRead) as BlockTable; 
BlockTableRecord acBlkTblRec = acTrans.GetObject(acTab[BlockTableRecord.ModelSpace], OpenMode.ForWrite) as BlockTableRecord; 
Circle newCircle = new Circle(); 
newCircle.SetDatabaseDefaults(); 
newCircle.Center = centerPoint; 
newCircle.Radius = 10; 
acBlkTblRec.AppendEntity(newCircle); 
acTrans.AddNewlyCreatedDBObject(newCircle, true); 
acTrans.Commit(); 
} 
} 
}