Abstract: Embodiments are directed to providing support for customized element layouts in a user interface. In one scenario, a computer system provides a user interface (UI) for a software application. The user interface includes multiple different UI elements arranged according to a custom layout. The computer system receives a user input that indicates various user interaction characteristics that are to be customized for the UI by a custom layout panel. The custom layout panel selects a characteristic modification interface based on which user interaction characteristics are to be customized, and implements the selected interface to customize the indicated interaction characteristics.

Abstract: Embodiments are directed to implementing data received from a virtualized data source and to efficiently providing data from a virtualized data source. In an embodiment, a computer system user interface (UI) sends a request for data elements to a data source. The computer system receives from the data source an indication that placeholder data is to be displayed while the requested data is retrieved and transmitted. The computer system then displays placeholder data in the UI for each of the requested data elements and dynamically adds the requested data elements to the displayed placeholder data as each data element is received from the data source. The data elements are dynamically added to the UI as they are received from the data source.