1. wxTextCtrl::SetBackgroundColour() now works

2. wxListBox::SetBackgroundColour() now does something, although still not
   what I'd like
3. wxColour() now has a ctor from "const char *" to allow calls like
   SetBackgroundColour("green");
4. controls sample modified to use colors


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@872 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/window.h

@@ -315,6 +315,12 @@ public:
   virtual void GetClientSizeConstraint(int *w, int *h) const ;
   virtual void GetPositionConstraint(int *x, int *y) const ;
 
+protected:
+  // set background colour for arbitrary window (useful because some windows
+  // don't work with m_wxwindow, e.g. wxTextCtrl)
+  void SetBackgroundColourHelper( const wxColour &colour, GdkWindow *window );
+
+private:
   DECLARE_EVENT_TABLE()
 };