If you want to use a diagram I’ve found that wmf format is better than either jpeg or png, they resize much better. Design or CAD programs usually allow you to export your drawing as a wmf.
You don’t need a picture control, just go to Edit and Import Picture to Clipboard and select the image file. Now paste directly onto your front panel. I often use in the background of a cluster to produce a mimic display. Some of the large system diagrams can show over 100 signals, updating in real time.
