In this window you can specify the initial values for the newly created object.
Object type - either Button or Static object.
Object state type - Image, Text or Rectangle.
Synchronize text - if this is enabled and the object state type is set to "Text" in several states, the text is kept in sync between those states, provided that they initially have the same value or are empty.
For an Image object state you can specify an image file.
Described here.
Described here.