--- a/src/trees/db_tree.tcl	2013-12-15 01:30:09.000000000 +0600
+++ b/src/trees/db_tree.tcl	2014-08-11 20:58:33.087523299 +0600
@@ -4,6 +4,7 @@
 use src/shortcuts.tcl
 use src/common/tktree_tracer.tcl
 use src/common/dnd.tcl
+use src/common/session.tcl
 
 #>
 # @class DBTree