Update ComboBoxMaster and Slave with an improved coding for the method onCreate.

static/plugin_dbui/src/form/field/ComboBoxMaster.js

@@ -166,33 +166,38 @@ Ext.define('Dbui.form.field.ComboBoxMaster', {
         "use strict";
 
         var me = this,
-            data = [],
+            displayField = me.displayField,
             keys = [],
+            model = me.model,
+            store = me.store,
+            valueField = me.valueField,
             i, master, record;
 
+        store.removeAll(true);
+
         if (me.userReset) {
-            data = [
-                [me.emptyText, null]
-            ];
+
+            record = model.create();
+            record.set(displayField, me.emptyText);
+            record.set(valueField, undefined);
+
+            store.add(record);
         }
 
         for (i = 0; i < records.length; i += 1) {
 
-            master = records[i].get(me.displayField);
+            master = records[i].get(displayField);
 
             if (keys.indexOf(master) === -1) {
                 keys.push(master);
 
-                record = me.model.create();
-                record.set(me.displayField, master);
-                record.set(me.valueField, records[i].get(me.valueField));
+                record = model.create();
+                record.set(displayField, master);
+                record.set(valueField, records[i].get(valueField));
 
-                data.push(record);
+                store.add(record);
             }
         }
-
-        // clear the store and load new data
-        me.store.loadRecords(data, false);
     },
 
     /**

static/plugin_dbui/src/form/field/ComboBoxSlave.js

@@ -203,31 +203,34 @@ Ext.define('Dbui.form.field.ComboBoxSlave', {
         "use strict";
 
         var me = this,
-            data = [],
+            displayField = me.displayField,
             keys = [],
+            masterValueField = me.masterValueField,
+            model = me.model,
+            store = me.store,
+            valueField = me.valueField,
             i, key, master, record, slave;
 
+        store.removeAll(true);
+
         for (i = 0; i < records.length; i += 1) {
 
-            master = records[i].get(me.masterValueField);
-            slave = records[i].get(me.displayField);
+            master = records[i].get(masterValueField);
+            slave = records[i].get(displayField);
 
             key = master + slave;
 
             if (keys.indexOf(key) === -1) {
                 keys.push(key);
 
-                record = me.model.create();
-                record.set(me.masterValueField, master);
-                record.set(me.displayField, slave);
-                record.set(me.valueField, records[i].get(me.valueField));
+                record = model.create();
+                record.set(masterValueField, master);
+                record.set(displayField, slave);
+                record.set(valueField, records[i].get(valueField));
 
-                data.push(record);
+                store.add(record);
             }
         }
-
-        // clear the store and load new data
-        me.store.loadRecords(data, false);
     },
 
     /**