diff --git a/src/widget/multitree/multi.tree.combo.js b/src/widget/multitree/multi.tree.combo.js
index 4e8f4a019..a6763d87e 100644
--- a/src/widget/multitree/multi.tree.combo.js
+++ b/src/widget/multitree/multi.tree.combo.js
@@ -5,16 +5,6 @@
  */
 
 BI.MultiTreeCombo = BI.inherit(BI.Single, {
-
-    constants: {
-        offset: {
-            top: 0,
-            left: 0,
-            right: 0,
-            bottom: BI.SIZE_CONSANTS.LIST_ITEM_HEIGHT + 1,
-        },
-    },
-
     _defaultConfig: function () {
         return BI.extend(BI.MultiTreeCombo.superclass._defaultConfig.apply(this, arguments), {
             baseCls: "bi-multi-tree-combo",
@@ -43,7 +33,12 @@ BI.MultiTreeCombo = BI.inherit(BI.Single, {
             watermark: o.watermark,
             // adapter: this.popup,
             masker: {
-                offset: this.constants.offset
+                offset: {
+                    left: 0,
+                    top: 0,
+                    right: 0,
+                    bottom: BI.SIZE_CONSANTS.LIST_ITEM_HEIGHT + 1,
+                },
             },
             searcher: {
                 type: "bi.multi_tree_searcher",
@@ -241,7 +236,12 @@ BI.MultiTreeCombo = BI.inherit(BI.Single, {
                 type: "bi.multi_tree_check_pane"
             },
             masker: {
-                offset: this.constants.offset
+                offset: {
+                    left: 0,
+                    top: 0,
+                    right: 0,
+                    bottom: BI.SIZE_CONSANTS.LIST_ITEM_HEIGHT + 1,
+                },
             },
             itemsCreator: o.itemsCreator,
             valueFormatter: o.valueFormatter,
diff --git a/src/widget/multitree/multi.tree.insert.combo.js b/src/widget/multitree/multi.tree.insert.combo.js
index 4783036b3..4e4a62e8d 100644
--- a/src/widget/multitree/multi.tree.insert.combo.js
+++ b/src/widget/multitree/multi.tree.insert.combo.js
@@ -6,15 +6,6 @@
 
 BI.MultiTreeInsertCombo = BI.inherit(BI.Single, {
 
-    constants: {
-        offset: {
-            top: 0,
-            left: 0,
-            right: 0,
-            bottom: BI.SIZE_CONSANTS.LIST_ITEM_HEIGHT + 1
-        }
-    },
-
     _defaultConfig: function () {
         return BI.extend(BI.MultiTreeInsertCombo.superclass._defaultConfig.apply(this, arguments), {
             baseCls: "bi-multi-tree-insert-combo",
@@ -41,7 +32,12 @@ BI.MultiTreeInsertCombo = BI.inherit(BI.Single, {
             valueFormatter: o.valueFormatter,
             // adapter: this.popup,
             masker: {
-                offset: this.constants.offset
+                offset: {
+                    left: 0,
+                    top: 0,
+                    right: 0,
+                    bottom: BI.SIZE_CONSANTS.LIST_ITEM_HEIGHT + 1,
+                },
             },
             searcher: {
                 type: "bi.multi_tree_searcher",
@@ -252,7 +248,12 @@ BI.MultiTreeInsertCombo = BI.inherit(BI.Single, {
             },
             itemsCreator: o.itemsCreator,
             masker: {
-                offset: this.constants.offset
+                offset: {
+                    left: 0,
+                    top: 0,
+                    right: 0,
+                    bottom: BI.SIZE_CONSANTS.LIST_ITEM_HEIGHT + 1,
+                },
             },
             valueFormatter: o.valueFormatter,
             value: o.value
diff --git a/src/widget/multitree/multi.tree.list.combo.js b/src/widget/multitree/multi.tree.list.combo.js
index 59e46a8de..c4be0a760 100644
--- a/src/widget/multitree/multi.tree.list.combo.js
+++ b/src/widget/multitree/multi.tree.list.combo.js
@@ -5,16 +5,6 @@
  */
 
 BI.MultiTreeListCombo = BI.inherit(BI.Single, {
-
-    constants: {
-        offset: {
-            top: 0,
-            left: 0,
-            right: 0,
-            bottom: BI.SIZE_CONSANTS.LIST_ITEM_HEIGHT + 1,
-        },
-    },
-
     _defaultConfig: function () {
         return BI.extend(BI.MultiTreeListCombo.superclass._defaultConfig.apply(this, arguments), {
             baseCls: "bi-multi-tree-list-combo",
@@ -44,7 +34,12 @@ BI.MultiTreeListCombo = BI.inherit(BI.Single, {
             valueFormatter: o.valueFormatter,
             // adapter: this.popup,
             masker: {
-                offset: this.constants.offset
+                offset: {
+                    left: 0,
+                    top: 0,
+                    right: 0,
+                    bottom: BI.SIZE_CONSANTS.LIST_ITEM_HEIGHT + 1,
+                },
             },
             searcher: {
                 type: "bi.multi_list_tree_searcher",