Member variable TBrowse():goTopBlock Foundation

This instance variable contains a code block which moves the row pointer of the data source to the first data row (generally the first data row of a table). A TBrowse object evaluates this code block in its method :goTop(), passing a reference to itself as an argument. :gotopBlock is evaluated primarily as a response to user input indicating that the TBrowse object should retrieve data at the beginning of its data source which the user cannot currently see. This generally results in a call to {|| DbGoTop()}. When a TBrowse object is first instantiated, this instance variable contains the value NIL.