Troubleshooting WPF Popup Controls blocking other programs

 Public classpopupnontopmost:popup{ Public StaticDependencyProperty Topmostproperty =Window.TopmostProperty.AddOwner (typeof(popupnontopmost),NewFrameworkpropertymetadata (false, ontopmostchanged));  Public BOOLTopmost {Get{return(BOOL) GetValue (Topmostproperty); }        Set{SetValue (topmostproperty, value);} }    Private Static voidontopmostchanged (DependencyObject obj, DependencyPropertyChangedEventArgs e) {(obj aspopupnontopmost).    UpdateWindow (); }    protected Override voidonopened (EventArgs e) {UpdateWindow (); }    Private voidUpdateWindow () {varhwnd = ((HwndSource) presentationsource.fromvisual ( This. Child)).        Handle;        Rect rect; if(GetWindowRect (hwnd, outrect)) {SetWindowPos (hwnd, topmost? -1: -2, Rect. Left, rect. Top, (int) This. Width, (int) This. Height,0 ); }    }    #regionP/invoke Imports & Definitions[StructLayout (layoutkind.sequential)] Public structRECT { Public intLeft ;  Public intTop;  Public intRight ;  Public intBottom; } [DllImport ("user32.dll" )]    [return: MarshalAs (unmanagedtype.bool)]Private Static extern BOOLGetWindowRect (IntPtr hWnd, outRECT LpRect); [DllImport ("User32", EntryPoint ="SetWindowPos" )]    Private Static extern intSetWindowPos (IntPtr hWnd,intHwndinsertafter,intXintYintCxintCyintwflags); #endregion}

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Troubleshooting WPF Popup Controls blocking other programs