net9.0-windows10.0.22621 
namespace Microsoft.UI.Xaml.Controls.Primitives
{
    [ContractVersion(typeof(WinUIContract), 65536U)]
    [ProjectedRuntimeClass(typeof(IFlyoutBase))]
    [WindowsRuntimeHelperType(typeof(FlyoutBase))]
    [WindowsRuntimeType("Microsoft.UI.Xaml")]
    public class FlyoutBase : DependencyObject, IEquatable<FlyoutBase>, ICustomQueryInterface, IDynamicInterfaceCastable, IWinRTObject
    {
        public static DependencyProperty TargetProperty { get; }
    }
}
nuget.org
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Reference this API
.NET 6.07.08.09.0
Information specific to net9.0
Platforms This API is only available when you target a specific platform:
Windows 10.0.1776310.0.1836210.0.1904110.0.2034810.0.2200010.0.22621
Information specific to net9.0-windows10.0.22621
Assemblies

Microsoft.WinUI , Version=3.0.0.0, PublicKeyToken=de31ebe4ad15742b

Microsoft.WinUI , Version=3.0.0.0, PublicKeyToken=de31ebe4ad15742b

Referencing

Your project needs a package reference to Microsoft.WindowsAppSDK.

Package Microsoft.WindowsAppSDK (1.7.250208002-preview1) net6.0-windows10.0.22621
Platform Restrictions

The property getter is only supported on the following platforms:

  • Windows >= 10.0.17763
  • Built-in API
  • Package-provided API