Hi, I hava gone through all the Tutorials, In the SelectionLab example,we can get some information in detail if we use the InfoTool in the toolbar and I have scan the source code of this tool.when I download some other shp files except the world map of the tutorilal from internet and then the Infotool return nothing except the clicked position location .I want to know why is this ?does not every shp file have the same format?shall I look into the shp file in detail or shoud I look into the InfoToo tool  for more detail even then I should look into some other classes such  as the query class?