Click the "Add Pictures" button to add pictures to your Library.
You can choose among the sample pictures available with Controls Generator, or select your own pictures. See System requirements for compatible pictures formats. Press the "Ctrl" key to select multiple items.
Once you click "OK", your pictures will be added to the Library and analyzed to identifies the colors they contain. You can add new pictures at anytime.
Mouse hover an element in your Picture Library to display it's preview at the bottom of the list.