1. An electronic device implemented method, comprising: displaying, using a processor, a plurality of graphical elements of an executable graphical model of a dynamic system on a display device; receiving an indication of a graphical operation, the graphical operation: involving a plurality of source graphical elements, and establishing a relationship between the plurality of source graphical elements and two or more target graphical elements of the plurality of graphical elements; identifying the target graphical elements from among the plurality of graphical elements when the target graphical elements are compatible with: the graphical operation, and one or more characteristics associated with the source graphical elements, the one or more characteristics of the source graphical elements comprising one or more of: a block sample time, a block restrictive flag, a port dimension attribute, a data type of data supplied by the source graphical element, a sample rate, a data complexity, a unit attribute, a physical domain attribute, a value range, and a data dimensionality; and visually indicating the identified target graphical elements are compatible with the graphical operation on the display device.