[gtkmm] How to use themes?

[Alex <d_f0rce gmx de>]

Hi,

I'm trying to change the layout of my program via the gtkrc config file. My 
~/.gtkrc file is used by GTK, but I can't set specific styles for specific 
widgets.

~/.gtkrc
-----------------
style "my-labels"
{
  font="-monotype-Arial-medium-r-normal-*-18-*-*-*-*-*-iso8859-1"
}

widget "*MYLabel*" style "my-labels"
-----------------

code:
--------------
labelWidget.set_name( "MYLabel" );

Glib::RefPtr<Gtk::Style> labelStyle = Gtk::RC::get_style( labelWidget );
labelWidget.set_style( labelStyle );
--------------

The gtk label is displayed fine, but the font can't be controlled via the 
gtkrc file. It is always set to the default font size for labels.

How can I "load" the settings for specific widgets from a gtkrc file?

Greetings,
Alex