add a note about changing selection background colour

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@44641 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/latex/wx/vlbox.tex

@@ -367,6 +367,10 @@ Sets the colour to be used for the selected cells background. The background of
 the standard cells may be changed by simply calling
 \helpref{SetBackgroundColour}{wxwindowsetbackgroundcolour}.
 
+Notice that using non-default background colour may result in control having
+appearance different from the similar native controls and so should in general
+be avoided.
+
 \wxheading{See also}
 
 \helpref{GetSelectionBackground}{wxvlistboxgetselectionbackground}