目的是通过控件值来实现不同的列显示与隐藏，但测试会闪一下后被再覆盖。      int show_col_ui()  {  string zh;  zh=gui_get_val("ComboBox_Ext_Account_Id");  switch(zh)  {  case '01':  grid_set_col_width("MG_Item","a1",0);  grid_set_col_width("MG_Item","a2",0);  grid_set_col_width("MG_Item","a3",20);  grid_set_col_width("MG_Item","a4",20);  break;    case '02':  grid_set_col_width("MG_Item","a1",20);  grid_set_col_width("MG_Item","a2",20);  grid_set_col_width("MG_Item","a3",0);  grid_set_col_width("MG_Item","a4",0);  break;  }  return 1;  }    int func_show()  {  show_col_ui();    return 1;  };      int obj_change()  {    //change_obj  if (change_obj=="ComboBox_Ext_Account_Id")  {  show_col_ui();  }    return 1;