Right now you need a "special" div with a flash and some JS code to export a chart to image, pdf, etc. I read the reason about the need of a "save" button and is correct, but it can be improved anyway.
When you use context menu to export (right click> export as png) the chart shadow and you can see a progress bar, when finish the progress bar get out and you can click the save button. Why? why just don't add an option like: "showSaveButton" so when progress bar finish the char is yet shaded with 2 buttons: "save" & "cancel"
This way you don't need a separate GUI,, or separate div, or even JS all is handled by the chart itself.
Is this possible?