Detecting Modern UI Activation in Windows 8

An application I'm currently working on requires that it be disabled whenever the windows 8 modern ui is activated. At first glance this seems like it should be easy, but there isn't currently an API that supports this natively in c#.

It looks like Microsoft did implement support via COM though. Solution copied here for reference:

http://stackoverflow.com/questions/12009999/imetromodeislaunchervisible-in-c-sharp-via-pinvoke

Definition:

[ComImport, Guid("2246EA2D-CAEA-4444-A3C4-6DE827E44313"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
public interface IAppVisibility {
	HRESULT GetAppVisibilityOnMonitor([In] IntPtr hMonitor, [Out] out 				MONITOR_APP_VISIBILITY pMode);
    HRESULT IsLauncherVisible([Out] out bool pfVisible);
	HRESULT Advise([In] IAppVisibilityEvents pCallback, [Out] out int 		pdwCookie);
	HRESULT Unadvise([In] int dwCookie);
}
//...
public enum HRESULT : long {
    S_FALSE = 0x0001,
    S_OK = 0x0000,
    E_INVALIDARG = 0x80070057,
    E_OUTOFMEMORY = 0x8007000E
}

public enum MONITOR_APP_VISIBILITY {
	MAV_UNKNOWN = 0,         // The mode for the monitor is unknown
	MAV_NO_APP_VISIBLE = 1,
	MAV_APP_VISIBLE = 2
}

[ComImport, Guid("6584CE6B-7D82-49C2-89C9-C6BC02BA8C38"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
public interface IAppVisibilityEvents {
HRESULT AppVisibilityOnMonitorChanged(
    [In] IntPtr hMonitor,
    [In] MONITOR_APP_VISIBILITY previousMode,
    [In] MONITOR_APP_VISIBILITY currentMode);

HRESULT LauncherVisibilityChange([In] bool currentVisibleState);
}

Usage:

Type tIAppVisibility = Type.GetTypeFromCLSID(new Guid("7E5FE3D9-985F-4908-91F9-EE19F9FD1514"));
IAppVisibility appVisibility = (IAppVisibility)Activator.CreateInstance(tIAppVisibility);

bool launcherVisible;
if(HRESULT.S_OK == appVisibility.IsLauncherVisible(out launcherVisible)) {
	// Here you can use the launcherVisible flag
}