typedef gboolean (*VikLayerFuncSelectRelease) (VikLayer *, GdkEventButton *, VikViewport *, tool_ed_t*);
typedef gboolean (*VikLayerFuncSelectedViewportMenu) (VikLayer *, GdkEventButton *, VikViewport *);
typedef gboolean (*VikLayerFuncSelectRelease) (VikLayer *, GdkEventButton *, VikViewport *, tool_ed_t*);
typedef gboolean (*VikLayerFuncSelectedViewportMenu) (VikLayer *, GdkEventButton *, VikViewport *);