Examples of the disclosure provide a system and method for receiving a component at a design surface, the component representing a user interface element of an application. A selection of the component is received and a selection of at least a portion of a first target component is detected. Based on the selection of the first target component, a first property of the first target component is determined to use in an expression, the expression to be dynamically evaluated at runtime of the component. The expression automatically generated to change a property of the component based on the first property of the first target component.