the example demonstrates the use of WPF bitmap effects to apply visual effects to some of the GUI elements. This application, however, is not an attempt to build a Windows Media Player in disguise it in the form of a WPF application it also introduces opacity masks, which can be used to hide parts of an element-the example demonstrates the use of WPF bitmap effects to apply visual effects to some of the GUI elements. This application, however, is not an attempt to build a Windows Media Player in disguise it in the form of a WPF application　it also introduces opacity masks, which can be used to hide parts of an element