+ /**
+ * Enables or disables the coloured background for this trace.
+ */
+ void set_coloured_bg(bool state);
+
+ /**
+ * Returns true if the item may be dragged/moved.
+ */
+ bool is_draggable() const;
+
+ /**
+ * Selects or deselects the signal.
+ */
+ void select(bool select = true);
+