The attached VI shows the basics of how to save an image of a VI's front panel:
1) You open a reference to the VI
2) Using invoke node, you then get the front panel image.
3) Close the VI reference
4) Save the image to the file format of your choice (I picked the VI for JPEG - you can use which every one you want).
In the top path control enter (or browse to) the path to the VI that you want to capture. In the second path control, enter the path (and filename) for the destination image file. Run this VI and it will create a file containing the front panel image of the VI you selected.
Mike...