void vik_layers_panel_set_viewport ( VikLayersPanel *vlp, VikViewport *vvp );
//gboolean vik_layers_panel_tool ( VikLayersPanel *vlp, guint16 layer_type, VikToolInterfaceFunc tool_func, GdkEventButton *event, VikViewport *vvp );
VikViewport *vik_layers_panel_get_viewport ( VikLayersPanel *vlp );
void vik_layers_panel_set_viewport ( VikLayersPanel *vlp, VikViewport *vvp );
//gboolean vik_layers_panel_tool ( VikLayersPanel *vlp, guint16 layer_type, VikToolInterfaceFunc tool_func, GdkEventButton *event, VikViewport *vvp );
VikViewport *vik_layers_panel_get_viewport ( VikLayersPanel *vlp );