update

demo/js/core/abstract/combination/demo.combo.js

@@ -250,7 +250,6 @@ Demo.Func = BI.inherit(BI.Widget, {
 
         var dynamicCombo = BI.createWidget({
             type: "bi.combo",
-            dynamic: true,
             el: {
                 type: "bi.button",
                 text: "搜索",

dist/bundle.css

@@ -1237,6 +1237,9 @@ i {
   -o-align-items: center;
   align-items: center;
 }
+.bi-flex-center-layout > * {
+  margin: auto;
+}
 .bi-flex-horizontal-layout {
   display: box;
   /* OLD - Android 4.4- */

dist/core.css

@@ -1237,6 +1237,9 @@ i {
   -o-align-items: center;
   align-items: center;
 }
+.bi-flex-center-layout > * {
+  margin: auto;
+}
 .bi-flex-horizontal-layout {
   display: box;
   /* OLD - Android 4.4- */

dist/core_without_normalize.css

@@ -954,6 +954,9 @@
   -o-align-items: center;
   align-items: center;
 }
+.bi-flex-center-layout > * {
+  margin: auto;
+}
 .bi-flex-horizontal-layout {
   display: box;
   /* OLD - Android 4.4- */

dist/demo.js

@@ -5966,7 +5966,6 @@ BI.shortcut("demo.combo_group", Demo.Func);Demo.Func = BI.inherit(BI.Widget, {
 
         var dynamicCombo = BI.createWidget({
             type: "bi.combo",
-            dynamic: true,
             el: {
                 type: "bi.button",
                 text: "搜索",

src/css/core/wrapper/flex.center.css

@@ -38,3 +38,6 @@
   -o-align-items: center;
   align-items: center;
 }
+.bi-flex-center-layout > * {
+  margin: auto;
+}

src/less/core/wrapper/flex.center.less

@@ -34,4 +34,7 @@
   -ms-align-items: center;
   -o-align-items: center;
   align-items: center;
+  > * {
+    margin: auto;
+  }
 }