Autistic people belong to a group with heterogenic conditions that are considerable dynamic. There are several applications specific for autistic users to support their treatment. However, several works do not describe the process for choosing the interface elements to differentiate the specific aspects for such audience. These aspects are important, since an interface containing attractive elements for autistic people can provide a better interaction. This paper presents a study to identify the preferences of autistic children with regards to the interface components. The study was divided in two stages: (a) regarding the view of practitioners that deal directly with the children and with the presence of the researchers; and (b) with the presence of the practitioners, but without the presence of the researchers. This paper also presents the identified aspects, developing a collaborative repository to store recommendations that support the design of interfaces that are specific for autistic children.