1 files changed, 2 insertions, 0 deletions

diff --git a/js/tools/ToolBase.js b/js/tools/ToolBase.js
index f43b1b58..88333c74 100755
--- a/js/tools/ToolBase.js
+++ b/js/tools/ToolBase.js
@@ -35,6 +35,8 @@ exports.toolBase = Montage.create(Component, {
     _currentX: {value: 0, writable: true},
     _currentY: {value: 0, writable: true},
 
+    _dragPlane: { value: null },
+
     /**
      * This function is for specifying custom feedback routine
      * upon mouse over.