/* set margins at first time */
MediaMargins margins = null; // Margins for the dialog Margins fields
if (isMarginsEnabled) { // Margins fields are enabled and can be edited
Media selectedMedia = (Media) sizeBox.getSelectedItem();
boolean isMediaSizeSelected = (selectedMedia == null)
? false :
selectedMedia.getClass().isAssignableFrom(MediaSizeName.class);
MediaSize selectedSize = isMediaSizeSelected
? MediaSize.getMediaSizeForName((MediaSizeName) selectedMedia)
: null;
if (isMediaSupported