when I try to connect the image object reference (in case of image source is 'use reference'),I cant reach to the second level reference. for example : If I have object (A) for the widget and show some data on object (B) and the image is object (C) where the relation as follow: A-->B-->C (A has 1 B and B has one C) how can i reach to the C Object.
All appstore widget can reference objects only one deep. So you need to either store a reference on A (or B) as well, or add a (virtual) String attribute on A (or B) with the calculated filename. (Which is 'file?guid=<GUID here>' or 'file?fileid=<FileID here>' in 2.5.2 upward)