Setting Background to "Disabled Brush"

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XAML

WPF

I know this should be easy. I mostly don't know what the brush is.

I want to make a Textbox (and some other UI elements like a ComboBox, DatePicker) to look as though they are disabled, but actually be enabled.

The reason I want to do this is we do not like the behavior of disabled. For example, no tooltips, no copy from etc.

I understand that this is the behavior and why. However our end users want it disabled but to be able to know what it is for (i.e. still need tooltips) and they want to 'grab' the active data (i.e. copy to buffer).
So essentially we just need to set the read only to true on the appropriate UI elements. However, then it looks enabled (I know.. I know... cause it is). So I need it to look disabled.

I want to style the brushes (text and background) to be that of the disabled. However I can't find the background brush for disabled, just the text brush.

http://msdn.microsoft.com/en-us/library/system.windows.systemcolors.graytextbrushkey.aspx[^]

Anybody know what it is?