TSimpleGraph node background image name?

[HPW]

In the demo sample2.sgp there are 2 nodes with background images.
When open the property window I can get no information what the current
background image is.

Questions:

How are the images stored in the sgp? Compressed?
External references possible?
When I use one background image twice is it stored once?
Is the used filename and extension stored inside the sgp?
Is is possible to show it in the backgroud-change dialog
or in another place inside property window?
Can you include the source bitmaps with the demo app,
so a tester can play with them.
How do I get the tranzparency in the right background?
Is a keycolor used?

[Kambiz]

SimpleGraph stores images in the same way that TImage does.

For transparency, look for TPicture class in Delphi's help.