1. A computer system including one or more computer-readable storage media having computer-executable components stored thereon for integrating user interfaces within an application, the computer-executable components comprising: an identification component for identifying one or more reference windows having a size within a primary application via a secondary application; a monitoring component for monitoring the one or more reference windows within the primary application via the secondary application; a window creating component for creating at least one replacement window having the size by the secondary application, wherein the at least one replacement window corresponds to the secondary application different from the primary application, the secondary application stored on the computer system; and an aligning component for aligning the at least one replacement window over the one or more reference windows in a position that hides all areas of the one or more reference windows.