A toy construction set comprising a first toy construction element configured to resemble a toy construction element and toy construction elements which contains electronic units controllable from said first element, wherein the elements form an integrated toy structure when incorporated therein. The first toy construction element has means, integrated within it, for programming the element by means of a user interface and for storing a program to provide controlled actions of the structure within which it is incorporated. Additionally, the first toy construction element is configured to transmit the program as a download program to a second construction toy.