ArcMap Addins如何弹出指北针属性界面？

IComPropertySheet pComPropertySheet = new ComPropertySheetClass(); 

pComPropertySheet.Title = NorthArrow; 



IPropertyPage northArrowPage = new NorthArrowElementPropertyPageClass(); 

pComPropertySheet.ClearCategoryIDs(); 

pComPropertySheet.AddPage(northArrowPage); 

IMxDocument mxdoc = ArcMap.Document as IMxDocument; 

IPageLayout pageLayout = mxdoc.PageLayout; 

IGraphicsContainer container = pageLayout as IGraphicsContainer; 

container.Reset(); 

IElement element = container.Next(); 

while (element != null) 

{ 

if (element is IMapSurroundFrame) 

break; 

element = container.Next(); 

} 

if(element == null) 

{ 

MessageBox.Show(element is null); 

return; 

} 



ISet pmyset = new SetClass(); 

pmyset.Add(mxdoc.ActiveView); 

pmyset.Add(element); 



if (pComPropertySheet.CanEdit(pmyset)) 

pComPropertySheet.EditProperties(pmyset, ArcMap.Application.hWnd);