以下是网上一段关于使用Microsoft ListView Control的脚本程序，我想知道这个脚本什么时候启动？
/***
*** This code snippet will populate the Microsoft ListView control with two lines of data,
*** where each line contains three columns.
***/

#define GetObject GetObject

__object *pdl = NULL;
__object *pic = NULL;
__object *obj = NULL;
__object *item = NULL;

pdl = __object_create("PDLRuntime");
pic = pdl->GetPicture("");
obj = pic->GetObject("Control1");

obj->ListItems->Clear();
obj->ColumnHeaders->Add(1, "Column1", "Column1");
obj->ColumnHeaders->Add(2, "Column2", "Column2");
obj->ColumnHeaders->Add(3, "Column3", "Column3");
obj->View = 3;

item = obj->ListItems->Add(1, "One", "One");
obj->ListItems->Item(1)->ListSubItems->Add(1, "Two", "Two");
obj->ListItems->Item(1)->ListSubItems->Add(2, "Three", "Three");

item = obj->ListItems->Add(2, "Monday", "Monday");
obj->ListItems->Item(2)->ListSubItems->Add(1, "Tuesday", "Tuesday");
obj->ListItems->Item(2)->ListSubItems->Add(2, "Wednesday", "Wednesday");

__object_delete(item);
__object_delete(obj);
__object_delete(pic);
__object_delete(pdl);