c# customizing controls on a save dialog — how to disable parent folder?

[bmcn]

I am working from the sample project here: http://www.codeproject.com/Articles/8086/Extending-the-save-file-dialog-class-in-NET

I have hidden the address/location bar at the top and made other modifications but I can't for the life of me manage to disable the button that lets you go up to the parent folder. Ist is in the ToolbarWindow32 class which is the problem. This is what I have at the moment but it is not working:

//0x440 gathered as controlID using Spy++
int parentFolderWindow = GetDlgItem(parent, 0x440);

//Doesn't work
//ShowWindow((IntPtr)parentFolderWindow, SW_HIDE);

//40961 gathered from Spy++ watching messages when clicking on the control
// doesn't work
//SendMessage(parentFolderWindow, TB_ENABLEBUTTON, 40961, 0);

// doesn't work
//SendMessage(parentFolderWindow, TB_SETSTATE, 40961, 0);

//Comes back as '{static}', am I working with the wrong control maybe?
GetClassName((IntPtr)parentFolderWindow, lpClassName, (int)nLength);

Alternatively, if they do use the parent folder button and go where I don't want them to, I'm able to look at the new directory they land in, is there a way I can force the navigation to go back?

[bmcn]

bump

[bmcn]

Last bump :(