diff --git a/src/modules/pages/connection/list/list.ts b/src/modules/pages/connection/list/list.ts
index 53db78d..99f7c18 100644
--- a/src/modules/pages/connection/list/list.ts
+++ b/src/modules/pages/connection/list/list.ts
@@ -21,7 +21,9 @@ export class ConnectionList extends BI.LoadingPane {
 
     watch = {
         connections: () => {
-            this.groupWidget.populate(this.renderList());
+            const times = this.groupWidget.times;
+            this.groupWidget.populate(this.renderList(0, this.groupWidget.times * 50));
+            this.groupWidget.times = times;
         },
     }
 
@@ -59,7 +61,9 @@ export class ConnectionList extends BI.LoadingPane {
                 populate(this.renderList((options.times - 1) * 50, options.times * 50));
             },
             hasNext: options => options.times * 50 < BI.size(this.model.connections),
-            
+            ref: (_ref: any) => {
+                this.groupWidget = _ref;
+            },
         };
     }
 
diff --git a/src/modules/pages/connection/list/list_item/list_item.ts b/src/modules/pages/connection/list/list_item/list_item.ts
index 55b1fbd..5a3b6e0 100644
--- a/src/modules/pages/connection/list/list_item/list_item.ts
+++ b/src/modules/pages/connection/list/list_item/list_item.ts
@@ -27,6 +27,7 @@ export class ListItem extends BI.BasicButton {
     comboWidget: any;
     nameLabel: any;
     nameEditor: any;
+    downListCombo: any;
     testStatus: TestStatus;
 
     watch = {
@@ -96,10 +97,14 @@ export class ListItem extends BI.BasicButton {
                             cls: 'dcm-link-other-font icon-size-16',
                         },
                         items: this.renderDownList(),
+                        ref: (_ref: any) => {
+                            this.downListCombo = _ref;
+                        },
                         listeners: [{
                             eventName: BI.DownListCombo.EVENT_CHANGE,
                             action: (value: string) => {
                                 this.itemActionCalculate().actionClac(value);
+                                this.downListCombo.setValue('');
                             },
                         }],