1. A method for providing a customizable user interface in a user equipment associated to a network management system for monitoring and configuring a data network, the method comprising the steps of: storing information comprising: a data model representative of the data network, wherein said data model has a plurality of elements and sub elements, each associated to a data type of a set of data types, a default widget library comprising a plurality of widgets, default registry data, having entries identifying for each data type of the set of data types, a default graphical representation, in the form of at least one predetermined widget from the default widget library, customization registry data, having at least one entry, defining at least one key with an associated customization registration, said at least one key identifying at least one element and/or sub element of the data model for which an alternative graphical representation as defined by customization registration is to be provided, receiving a user input that identifies a portion of the data network of interest for display in the user interface, generating a request for data from the data model based on the received user input, receiving data from the data model, said received data being representative for the portion of the data network of interest for display, selecting the alternative graphical representation for each element of the received data, having associated the at least one key and the default graphical representation for each element of the received data, not having associated the at least one key, and rendering, in the user interface, the portion of the data network of interest using the selected graphical representations.