Door Library Null Reference Exception

UseMnemonic property of Labels is giving me a problem. I am displaying one line of text from a database. It could contain a "&" and I do not want that replaced with a "_".

I first tried the following:

Label1.text=rStrReplace(text,"&","&&")

That was fine but I thought it would be better to just use the Door Library to set UseMnemonic to false:

Door.FromControl("Label1")
msgbox(Door.GetProperty("UseMnemonic")
Door.SetProperty("UseMnemonic",false)

Using either of the last 2 lines will cause a NullReferenceException error.

I'm using my previous code to get around this so just reporting my error.

Label.UseMnemonic is not supported by .Net Compact Framework.