BI-104081 fix: ButtonGroup的value属性传函数时，首次渲染不会进行setValue

src/base/combination/group.button.js

@@ -33,11 +33,9 @@ BI.ButtonGroup = BI.inherit(BI.Widget, {
             self.populate(newValue);
         }) : o.items;
         this.populate(items);
-        if (BI.isFunction(o.value)) {
+        o.value = BI.isFunction(o.value) ? this.__watch(o.value, function (context, newValue) {
-            this.__watch(o.value, function (context, newValue) {
             self.setValue(newValue);
-            })
+        }) : o.value;
-        }
         if (BI.isKey(o.value) || BI.isNotEmptyArray(o.value)) {
             this.setValue(o.value);
         }

src/base/combination/group.virtual.js

@@ -17,11 +17,9 @@ BI.VirtualGroup = BI.inherit(BI.Widget, {
             self.populate(newValue);
         }) : o.items;
         this.populate(items);
-        if (BI.isFunction(o.value)) {
+        o.value = BI.isFunction(o.value) ? this.__watch(o.value, function (context, newValue) {
-            this.__watch(o.value, function (context, newValue) {
             self.setValue(newValue);
-            })
+        }) : o.value;
-        }
         if (BI.isKey(o.value)) {
             this.setValue(o.value);
         }