diff --git a/src/main/webapp/resources/js/base/dataset.js b/src/main/webapp/resources/js/base/dataset.js
index 6369fc0f..76324a3b 100644
--- a/src/main/webapp/resources/js/base/dataset.js
+++ b/src/main/webapp/resources/js/base/dataset.js
@@ -450,6 +450,10 @@ class Dataset {
 		this._byKeys = {};
 		this._current = null;
 		
+		let data = this._getDataItems(obj);
+		this._items = data.items;
+		this._byKeys = data.byKeys;
+		/*
 		obj = obj || {};
 		let array = Array.isArray(obj) ? obj : this.conf.dataGetter(obj) || [];
 		if (!Array.isArray(array))
@@ -460,12 +464,62 @@ class Dataset {
 			let key = "key-" + this.getKey(item.data);
 			this._byKeys[key] = item;
 		});
+		*/
+		this.onDatasetChange(obj);
+		this.setState(!Array.isArray(obj) ? obj.state : state);
+		this.onDirtiesChange(this.dirty);
+		
+		return this;
+	}
+	
+	_getDataItems(obj) {
+		obj = obj || {};
+		let array = Array.isArray(obj) ? obj : this.conf.dataGetter(obj) || [];
+		if (!Array.isArray(array))
+			throw new Error("The data must be an array");
+		
+		let _items = array.map(e => new DataItem(e, this._formats)),
+			_byKeys = {};
+		_items.forEach(item => {
+			let key = "key-" + this.getKey(item.data);
+			_byKeys[key] = item;
+		});
+		
+		return {
+			items: _items,
+			byKeys: _byKeys
+		};
+	}
+	
+	/**Adds user data to the Dataset.
+	 * To get user data from an object, the dataGetter configured is called.
+	 * After user data is set, the methods
+	 * <ul>	<li>{@link Dataset#onDatasetChange}</li>
+	 *		<li>{@link Dataset#onCurrentChange}</li>
+	 *		<li>{@link Dataset#onSelectionChange}</li>
+	 *		<li>{@link Dataset#onDirtiesChange}</li>
+	 * </ul>
+	 * are called back.
+	 * @param {array|object} obj user data or an object that has user data
+	 * @returns {Dataset} the Dataset
+	 */
+	addData(obj) {
+		if (this.empty)
+			return this.setData(obj);
+		
+		let data = this._getDataItems(obj);
+		this._items = this._items.concat(data.items);
+		this._byKeys = {
+			...this._byKeys,
+			...data.byKeys
+		};
 		
 		this.onDatasetChange(obj);
 		this.setState(!Array.isArray(obj) ? obj.state : state);
 		this.onDirtiesChange(this.dirty);
 		
 		return this;
+		
 	}
 
 	/**Clears the Dataset's user data.
@@ -1140,6 +1194,7 @@ class DatasetControl {
 		this.prefix = conf.prefix;
 		this.prefixName = conf.prefixName;
 		this.infoSize = conf.infoSize;
+		this.appendData = conf.appendData;
 		
 		this.query = {};
 		
@@ -1184,13 +1239,23 @@ class DatasetControl {
 		ajax.get({
 			url:this.urls.load,
 			data:this.query,
-			success:resp => this.setData(resp)
+			success:resp => {
+				if (!this.appendData || this.query.pageNum == 1)
+					this.setData(resp);
+				else {
+					this.addData(resp);
+				}
+			}
 		});
 	}
 
 	setData(obj) {
 		this.dataset.setData(obj);
 	}
+	
+	addData(obj) {
+		this.dataset.addData(obj);
+	}
 
 	onDatasetChange(obj) {
 		debug("onDatasetChange", obj);