plugin.refreshLabelTree
The 'refreshLabelTree' function indicates myBase main program to refresh the label tree for the database.
- Prototype: plugin.refreshLabelTree(iDbPos);
 - Parameters:
- iDbPos: a position number (0-based) of the database on the tab control; -1 for the current database.
 
 - Return Value: 0 on success, or -1 on failed.
 - Example: plugin.refreshLabelTree(-1);