diff --git a/docs/renderers/Button-Group.md b/docs/renderers/ButtonGroup.md
similarity index 98%
rename from docs/renderers/Button-Group.md
rename to docs/renderers/ButtonGroup.md
index 863b61e8..f1ab0082 100644
--- a/docs/renderers/Button-Group.md
+++ b/docs/renderers/ButtonGroup.md
@@ -1,4 +1,4 @@
-## Button-Group
+## ButtonGroup
 
 按钮集合。
 
diff --git a/docs/renderers/Form/Button-Group.md b/docs/renderers/Form/ButtonGroup.md
similarity index 100%
rename from docs/renderers/Form/Button-Group.md
rename to docs/renderers/Form/ButtonGroup.md
diff --git a/examples/components/Doc.jsx b/examples/components/Doc.jsx
index d356e860..6eb04aba 100644
--- a/examples/components/Doc.jsx
+++ b/examples/components/Doc.jsx
@@ -617,9 +617,9 @@ export default {
                     }),
                 },
                 {
-                    label: 'Button-Group',
-                    path: '/docs/renderers/Button-Group',
-                    getComponent: (location, cb) => require(['../../docs/renderers/Button-Group.md'], (doc) => {
+                    label: 'ButtonGroup',
+                    path: '/docs/renderers/ButtonGroup',
+                    getComponent: (location, cb) => require(['../../docs/renderers/ButtonGroup.md'], (doc) => {
                         cb(null, makeMarkdownRenderer(doc));
                     }),
                 },
diff --git a/scss/components/form/_combo.scss b/scss/components/form/_combo.scss
index 21b8237e..aa3591ab 100644
--- a/scss/components/form/_combo.scss
+++ b/scss/components/form/_combo.scss
@@ -191,6 +191,10 @@
     color: $text--muted-color;
     font-size: $fontSizeSm;
     margin-left: $gap-xs;
+
+    &:empty {
+        display: none;
+    }
 }
 
 .#{$ns}ComboControl.is-inline {
diff --git a/src/renderers/Form/ButtonGroup.tsx b/src/renderers/Form/ButtonGroup.tsx
index 0862fc6e..f8ca3a63 100644
--- a/src/renderers/Form/ButtonGroup.tsx
+++ b/src/renderers/Form/ButtonGroup.tsx
@@ -81,7 +81,8 @@ export default class ButtonGroupControl extends React.Component<ButtonGroupProps
                 activeLevel: btnActiveLevel,
                 ...button
             }, {
-                key
+                key,
+                className: cx(button.className, btnClassName),
             }));
         }
 
diff --git a/src/types.ts b/src/types.ts
index 273f312f..8555ea00 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -67,6 +67,7 @@ export interface Button {
     icon?: string;
     size?: string;
     disabled?: boolean;
+    className?: string;
 };
 
 export type SchemaNode = number | string | Schema | SchemaArray;