\section{\class{wxMemoryDC}}\label{wxmemorydc}
-A memory device context provides a means to draw graphics onto a bitmap.
+A memory device context provides a means to draw graphics onto a bitmap. When
+drawing in to a mono-bitmap, using {\tt wxWHITE}, {\tt wxWHITE\_PEN} and
+{\tt wxWHITE\_BRUSH}
+will draw the background colour (i.e. 0) whereas all other colours will draw the
+foreground colour (i.e. 1).
\wxheading{Derived from}
Constructs a new memory device context.
Use the {\it Ok} member to test whether the constructor was successful
-in creating a useable device context. Don't forget to select a bitmap
+in creating a usable device context. Don't forget to select a bitmap
into the DC before drawing on it.
\membersection{wxMemoryDC::SelectObject}