diff --git a/src/lib/ui/Canvas.hx b/src/lib/ui/Canvas.hx
index 18500b4..a0247c2 100644
--- a/src/lib/ui/Canvas.hx
+++ b/src/lib/ui/Canvas.hx
@@ -1,5 +1,6 @@
 package lib.ui;
 
+import util.Rect;
 import util.Vec.Vec2;
 import kernel.ui.Pixel;
 
@@ -55,6 +56,13 @@ abstract Canvas(Array<Array<Pixel>>) to Array<Array<Pixel>> {
 
 		return max;
 	}
+
+	public function getBounds(): Rect {
+		return new Rect({x:0,y:0},{
+			x: maxWidth(),
+			y: hight()
+		});
+	}
 }
 
 class CanvasKeyValueIterator {
diff --git a/src/lib/ui/reactive/ListElement.hx b/src/lib/ui/reactive/ListElement.hx
index 2b367e8..1aff4da 100644
--- a/src/lib/ui/reactive/ListElement.hx
+++ b/src/lib/ui/reactive/ListElement.hx
@@ -1,14 +1,39 @@
 package lib.ui.reactive;
 
+import util.Pos;
+import util.Rect;
 import util.ObservableArray;
 import util.Vec.Vec2;
 
 class ListElement extends UIElement {
 
 	private final content:ObservableArray<UIElement>;
+	private var elementMap: Map<Rect,UIElement> = new Map(); // Position in the map is relative.
+	private var offset:Pos;
 
 	public function new(content: ObservableArray<UIElement>) {
-		super();
+		var events: UIEvents = {
+			onClick: (p)->{
+				var element = UIElement.getElementInMap((p.pos:Pos) - offset,elementMap);
+				if (element != null)
+					if (element.eventListner.onClick != null)
+						element.eventListner.onClick.invoke(p);
+			},
+			onMouseUp: (p)->{
+				var element = UIElement.getElementInMap((p.pos:Pos) - offset,elementMap);
+				if (element != null)
+					if (element.eventListner.onMouseUp != null)
+						element.eventListner.onMouseUp.invoke(p);
+			},
+			onMouseScroll: (p)->{
+				var element = UIElement.getElementInMap((p.pos:Pos) - offset,elementMap);
+				if (element != null)
+					if (element.eventListner.onMouseScroll != null)
+						element.eventListner.onMouseScroll.invoke(p);
+			},
+		};
+
+		super(events);
 
 		this.content = content;
 		this.content.subscribe(value -> {
@@ -17,9 +42,10 @@ class ListElement extends UIElement {
 		});
 	}
 
-	public function render(bounds:Vec2<Int>):Canvas {
+	public function render(bounds:Vec2<Int>,offset: Pos):Canvas {
 		var canvas: Canvas = new Canvas();
 		var writePoint:Vec2<Int> = {x: 0, y: 0};
+		this.offset = offset;
 
 		for(element in this.content.get()){
 			if (bounds.y - writePoint.y <= 0) {
@@ -30,9 +56,15 @@ class ListElement extends UIElement {
 			var childRender = element.render({
 				x: bounds.x,
 				y: bounds.y - writePoint.y
-			});
+			}, offset + writePoint);
 
 			canvas.combine(childRender, writePoint);
+			elementMap.set(new Rect(writePoint,
+				{
+					x: childRender.maxWidth() + writePoint.x,
+					y: writePoint.y + (childRender.hight() - 1),
+				}
+			),element);
 
 			writePoint = {x: 0, y: writePoint.y + childRender.hight()};
 		}
diff --git a/src/lib/ui/reactive/ReactiveUI.hx b/src/lib/ui/reactive/ReactiveUI.hx
index ebbb904..a86e690 100644
--- a/src/lib/ui/reactive/ReactiveUI.hx
+++ b/src/lib/ui/reactive/ReactiveUI.hx
@@ -1,7 +1,6 @@
 package lib.ui.reactive;
 
 import util.Rect;
-import kernel.Log;
 import util.Color;
 import util.Vec.Vec2;
 import kernel.ui.WindowContext;
@@ -157,7 +156,7 @@ class ReactiveUI {
 			var childRender = child.render({
 				x: bounds.x,
 				y: bounds.y - writePoint.y
-			});
+			},writePoint);
 
 			canvas.combine(childRender, writePoint);
 			elementMap.set(new Rect(writePoint,{x: childRender.maxWidth() + writePoint.x, y: writePoint.y + (childRender.hight() - 1)}),child);
diff --git a/src/lib/ui/reactive/TextElement.hx b/src/lib/ui/reactive/TextElement.hx
index 85c1150..d344628 100644
--- a/src/lib/ui/reactive/TextElement.hx
+++ b/src/lib/ui/reactive/TextElement.hx
@@ -1,7 +1,6 @@
 package lib.ui.reactive;
 
-import kernel.Log;
-import kernel.ButtonType;
+import util.Pos;
 import util.Observable;
 using tink.CoreApi;
 
@@ -26,7 +25,7 @@ class TextElement extends UIElement {
 		});
 	}
 
-	public function render(bounds:Vec2<Int>):Canvas {
+	public function render(bounds:Vec2<Int>,offset: Pos):Canvas {
 		var rtn = new Canvas();
 
 		for (i in 0...MathI.min(Math.floor(text.get().length / bounds.x) + 1, bounds.y)) {
diff --git a/src/lib/ui/reactive/UIElement.hx b/src/lib/ui/reactive/UIElement.hx
index 339aa63..dc43ed0 100644
--- a/src/lib/ui/reactive/UIElement.hx
+++ b/src/lib/ui/reactive/UIElement.hx
@@ -1,11 +1,18 @@
 package lib.ui.reactive;
 
+import util.Pos;
+import util.Rect;
 import util.Vec.Vec2;
 
 using tink.CoreApi;
 
 abstract class UIElement {
-	abstract public function render(bounds:Vec2<Int>):Canvas;
+	/**
+		Render the element inside the bounds. `offset` is the offset to the parents position
+		and can be used to calculate the absolute position of element.
+		Just save `offset` and pass it to the children.
+	**/
+	abstract public function render(bounds:Vec2<Int>, offset: Pos):Canvas;
 	public var changed(default, null):Signal<Noise>;
 	private final changedTrigger:SignalTrigger<Noise> = Signal.trigger();
 	public final eventListner:UIEvents = {};
@@ -16,4 +23,14 @@ abstract class UIElement {
 			this.eventListner = events;
 		}
 	}
+
+	public static function getElementInMap(pos: Pos,elementMap: Map<Rect,UIElement>):Null<UIElement>{
+		for (k => v in elementMap){
+			if (k.isInside(pos)){
+				return v;
+			}
+		}
+
+		return null;
+	};
 }