diff --git a/README.md b/README.md
index 66481b0e762c5f6b7e5f76c4e60235dc2bd2f915..a846b755ae512a1da1e608370a00d81d67769113 100644
--- a/README.md
+++ b/README.md
@@ -8,17 +8,23 @@ Needs react-native >= 0.14.2
 
 ![ui](./doc/ui.gif)
 
+![ui2](./doc/ui2.jpg)
+
 ###Documentation
 
 ####Props
-- <b>pickerBtnText</b> string, tool bar's btn text
+- <b>pickerBtnText</b> string, tool bar's confirm btn text
+- <b>pickerCancelBtnText</b> string, tool bar's cancel ben text
 - <b>pickerBtnStyle</b> textStylePropType, tool bar's btn style
 - <b>pickerToolBarStyle</b> viewStylePropType, tool bar's style
-- <b>pickerHeight</b> number
-- <b>showDuration</b> number
+- <b>pickerHeight</b> number, height of picker
+- <b>showDuration</b> number, animation of picker
+- <b>pickerTitle</b> string, title of picker
+- <b>pickerTitleStyle</b> textStylePropType, style of title
 - <b>pickerData</b> array
 - <b>selectedValue</b> any
 - <b>onPickerDone</b> function
+- <b>onPickerCancel</b> function
 
 ####Methods
 - <b>toggle</b> show or hide picker, default to be hiden
@@ -37,7 +43,6 @@ Needs react-native >= 0.14.2
 	import Picker from 'react-native-picker'
 	
 	<Picker
-		ref={picker => {this.picker = picker;}}
 		pickerHeight={300}
 		showDuration={300}
 		pickerData={}//picker`s value List
diff --git a/doc/ui2.jpg b/doc/ui2.jpg
new file mode 100644
index 0000000000000000000000000000000000000000..610c07416f809902fbe1ed7df120e6422345af2e
Binary files /dev/null and b/doc/ui2.jpg differ
diff --git a/index.js b/index.js
index f218451ae3b7fe06cf15a4ae52f28bf5f356692b..3605f88bf8214d7df5288ec52e9e87b01557934b 100644
--- a/index.js
+++ b/index.js
@@ -102,7 +102,7 @@ export default class PickerAny extends React.Component {
 			secondPickedData = props.selectedValue[1];
 			cascadeData = this._getCascadeData(pickerData, selectedValue, firstPickedData, secondPickedData, true);
 		}
-		//保存了已经选择到的数据
+		//save picked data
 		this.pickedValue = selectedValue;
 		this.pickerStyle = pickerStyle;
 		return {
@@ -482,7 +482,8 @@ let styles = StyleSheet.create({
 		flexDirection: 'row',
 		borderTopWidth: 1,
 		borderBottomWidth: 1,
-		borderColor: '#c3c3c3'
+		borderColor: '#c3c3c3',
+		alignItems: 'center'
 	},
 	pickerBtnView: {
 		flex: 1,
@@ -503,7 +504,7 @@ let styles = StyleSheet.create({
 		marginLeft: 20
 	},
 	pickerTitle: {
-		flex: 5,
+		flex: 4,
 		color: 'black',
 		textAlign: 'center'
 	},
diff --git a/package.json b/package.json
index f744227c42694c0d9b117c992213f725872d1118..62b17ccfa09e63a60fe493f67984c0a59081876d 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "react-native-picker",
-  "version": "0.2.7",
+  "version": "0.2.8",
   "description": "react-native-picker",
   "main": "index.js",
   "scripts": {