For some kinds of applications displaying as “maximised” is not enough, either because they want to make use of every single pixel of screen-space possible, or because displaying the task bar and associated window trimmings would be distracting or confusing for users of the application. The PowerPoint slide viewer is a good example of this, starting in “kiosk” mode to create a more immersive presentation and preventing audience members becoming distracted by the task bar and things in the notification area. Fortunately doing this for your own WPF application can be achieved quite easily by setting the WindowStyle and WindowState properties on the Window as shown below.
Xaml Code
<Window x:Class="LearnWPF.KioskMode.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="LearnWPF.KioskMode"
WindowStyle="None"
WindowState="Maximized">
WindowStyle should be set to None (this draws the window without any border, and is the same state you can use to create a WPF splash screen) and the WindowState set to Maximized. These properties can also be set from code. One small issue we have observed is if you try to change the WindowStyle in code after the WindowState has changed to Maximized the resulting window will be drawn without a border, but won’t display over the top of the status bar.