diff --git a/AlgebraicDataflowArchitectureModel/models/SimpleUI.model b/AlgebraicDataflowArchitectureModel/models/SimpleUI.model
index 9b54346..d31906b 100644
--- a/AlgebraicDataflowArchitectureModel/models/SimpleUI.model
+++ b/AlgebraicDataflowArchitectureModel/models/SimpleUI.model
@@ -1,81 +1,112 @@
 init {
-	screen := {"widgets": {"001": {"type": "button", "text": "OK", "state": 0}, 
-							"002": {"type": "textInput", "text": "", "state": 0}}, 
-				"layout": true}
+	screenTemplates := {
+				"000": {"widgets": {"001": {"type": "textInput", "text": "", "state": 0}, 
+									"002": {"type": "button", "text": "Next", "state": 0}}, 
+						"layout": true},
+				"001": {"widgets": {"003": {"type": "label", "text": "label", "state": 0}, 
+									"004": {"type": "button", "text": "Back", "state": 0}}, 
+						"layout": true}
+				}
 }
-
+ 
 native channel ScreenUpdate {
 	in screen(curSc: Json, update(curSc, nextSc)) = nextSc
 }
-
+ 
 native channel SetLayout {
 	in screen.layout(curLayout: Bool, setLayout(nextLayout)) = nextLayout
 }
-
+ 
 native channel SetVisible(wid: Str) {
 	in screen.widgets.{wid}.visible(curVisible: Bool, setVisible(nextVisible)) = nextVisible
 }
-
+ 
 native channel SetText(wid: Str) {
 	in screen.widgets.{wid}.text(curText: Str, setText(nextText)) = nextText
 }
-
+ 
 native channel SetX(wid: Str) {
 	in screen.widgets.{wid}.x(curX: Int, setX(nextX)) = nextX
 }
-
+ 
 native channel SetY(wid: Str) {
 	in screen.widgets.{wid}.y(curY: Int, setY(nextY)) = nextY
 }
-
+ 
 native channel SetWidth(wid: Str) {
 	in screen.widgets.{wid}.width(curWidth: Int, setWidth(nextWidth)) = nextWidth
 }
-
+ 
 native channel SetHeight(wid: Str) {
 	in screen.widgets.{wid}.height(curHeight: Int, setHeight(nextHeight)) = nextHeight
 }
-
+ 
 native channel MouseEvent(wid: Str) {
 	out screen.widgets.{wid}.state(curState: Int, mouseEvent(nextState)) = nextState
 }
-
+ 
 native channel TextEvent(wid: Str) {
 	out screen.widgets.{wid}.text(curText: Str, textEvent(nextText)) = nextText
 }
-
+ 
+channel ChangeCurScreen {
+	out curScreen(curScId: Str, changeCurScreen(nextScId)) = nextScId
+}
+ 
+channel ScreenTransition {
+	in curScreen(curScId: Str, transScreen(nextScId, screen)) = nextScId
+	ref screenTemplates.{nextScId}(screen, transScreen(nextScId, screen))
+	out screen(curS, transScreen(nextScId, screen)) = screen
+}
+ 
+channel EventDispatch(wid: Str) {
+	in screen.widgets.{wid}.state(curState: Int, dispatchEvent(curScId, wid, nextState)) = nextState
+	ref curScreen(curScId: Str, dispatchEvent(curScId, wid, nextState))
+	out screenTemplates.{curScId}.widgets.{wid}.state(curState: Int, dispatchEvent(curScId, wid, nextState)) = nextState
+}
+ 
+channel EventHandler1(scId: Str, wid: Str) {
+	in screenTemplates.{scId="000"}.widgets.{wid="002"}.state(curState: Int, handleEvent1(nextState)) = nextState
+	out curScreen(curScId: Str, handleEvent1(nextState)) = if(nextState == 0, "001", curScId)
+}
+ 
+channel EventHandler2(scId: Str, wid: Str) {
+	in screenTemplates.{scId="001"}.widgets.{wid="004"}.state(curState: Int, handleEvent2(nextState)) = nextState
+	out curScreen(curScId: Str, handleEvent2(nextState)) = if(nextState == 0, "000", curScId)
+}
+ 
 channel ChangeLayout {
 	out screen.layout(curLayout: Bool, changeLayout(layout)) = layout
 }
-
+ 
 channel ChangeX(wid: Str) {
 	out screen.widgets.{wid}.x(curX: Int, changeX(x)) = x
 }
-
+ 
 channel ChangeY(wid: Str) {
 	out screen.widgets.{wid}.y(curY: Int, changeY(y)) = y
 }
-
+ 
 channel AddButton {
 	out screen.widgets(widgets: Map, addButton(wid: Str, text: Str)) = insert(widgets, wid, {"type": "button", "text": text, "state": 0})
 }
-
+ 
 channel AddLabel {
 	out screen.widgets(widgets: Map, addLabel(wid: Str, text: Str)) = insert(widgets, wid, {"type": "label", "text": text, "state": 0})
 }
-
+ 
 channel AddTextInput {
 	out screen.widgets(widgets: Map, addTextInput(wid: Str)) = insert(widgets, wid, {"type": "textInput", "text": "", "state": 0})
 }
-
+ 
 channel AddMovableButton {
 	out screen.widgets(widgets: Map, addMovableButton(wid: Str, text: Str, x: Int, y: Int, width: Int, height: Int)) = insert(widgets, wid, {"type": "button", "text": text, "x": x, "y": y, "width": width, "height": height, "state": 0})
 }
-
+ 
 channel AddMovableLabel {
 	out screen.widgets(widgets: Map, addMovableLabel(wid: Str, text: Str, x: Int, y: Int, width: Int, height: Int)) = insert(widgets, wid, {"type": "label", "text": text, "x": x, "y": y, "width": width, "height": height, "state": 0})
 }
-
+ 
 channel AddMovableTextInput {
 	out screen.widgets(widgets: Map, addMovableTextInput(wid: Str, x: Int, y: Int, width: Int, height: Int)) = insert(widgets, wid, {"type": "textInput", "text": "", "x": x, "y": y, "width": width, "height": height, "state": 0})
-}
+}
\ No newline at end of file