You can use the Picture property to replace the picture's representation, without replacing the picture using the Add method. The Content property is read-only, instead you can replace the picture's content using the Add method, with the same key or passing a different PictureDisp object to Picture property. The Content property indicates the content of the picture, as being added by the Add method using the Picture parameter.  The Key property indicates the key of the picture. The Icon property indicates the index of the icon in the Images collection to be used instead for displaying the picture object.