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

src/gtk/textctrl.cpp

@@ -464,4 +464,12 @@ void wxTextCtrl::SetFont( const wxFont &font )
   gtk_widget_set_style( m_text, style );
 }
 
+// as our GTK widget is m_text and not m_widget, we have to override
+// SetBackgroundColour() to make it work
+void wxTextCtrl::SetBackgroundColour( const wxColour &colour )
+{
+  wxCHECK_RET( m_text != NULL, "invalid text ctrl" );
 
+  // NB: the GtkEntry and GtkText classes have text_area at the same offset
+  SetBackgroundColourHelper( colour, GTK_TEXT(m_text)->text_area );
+}