diff --git a/avr/devices/c03/test/main.asm b/avr/devices/c03/test/main.asm
index fef415e..7864097 100644
--- a/avr/devices/c03/test/main.asm
+++ b/avr/devices/c03/test/main.asm
@@ -256,23 +256,22 @@ test:
 
   bigcall GuiApp_GetRootWindow
   brcc DEBUG_STOP
-  sts rootWindow, r18
-  sts rootWindow+1, r19
-  mov xl, r18
-  mov xh, r19
-  ldi r16, 0                                                                                           ; OPTS
-  ldi r17, (WIDGET_PACK_FILLED<<WIDGET_PACK_HSELF0_BIT) | (WIDGET_PACK_FILLED<<WIDGET_PACK_VSELF0_BIT) ; PACK
-  ldi r20, LOW(RESSSOURCE_TXT_LIVINGROOM)
-  ldi r21, HIGH(RESSSOURCE_TXT_LIVINGROOM)
-  bigcall MainWindow_new
+  push yl
+    push yh
+      mov xl, r18
+      mov xh, r19
+      ldi r16, 0                                                                                           ; OPTS
+      ldi r17, (WIDGET_PACK_FILLED<<WIDGET_PACK_HSELF0_BIT) | (WIDGET_PACK_FILLED<<WIDGET_PACK_VSELF0_BIT) ; PACK
+      ldi r20, LOW(RESSSOURCE_TXT_LIVINGROOM)
+      ldi r21, HIGH(RESSSOURCE_TXT_LIVINGROOM)
+      bigcall MainWindow_new
+      mov xl, yl
+      mov xh, yh
+    pop yh
+  pop yl
   brcc DEBUG_STOP
-
-  sts mainWin1, yl
-  sts mainWin1+1, yh
-
-  ldd r16, Y+OBJECT_OFFS_FLAGS
-  sbr r16, (1<<WIDGET_FLAGS_VISIBLE_BIT) | (1<<WIDGET_FLAGS_LAYOUT_BIT) | (1<<WIDGET_FLAGS_DIRTY_BIT)
-  std Y+OBJECT_OFFS_FLAGS, r16
+  bigcall GuiApp_EnterWindow
+  brcc DEBUG_STOP3
 
   ret
 
diff --git a/avr/modules/lcd2/gui2/base/guiapp.asm b/avr/modules/lcd2/gui2/base/guiapp.asm
index 8256a92..2d364bd 100644
--- a/avr/modules/lcd2/gui2/base/guiapp.asm
+++ b/avr/modules/lcd2/gui2/base/guiapp.asm
@@ -14,6 +14,8 @@
 ; ***************************************************************************
 ; defines
 
+.equ GUIAPP_WINDOWSTACK_ENTRIES        = 8
+
 ; Widget in flash
 
 .equ GUIAPP_OFFS_BEGIN                 =  OBJECT_SIZE
@@ -26,7 +28,9 @@
 .equ GUIAPP_OFFS_TOUCHWIDGET_LO        =  GUIAPP_OFFS_BEGIN+6
 .equ GUIAPP_OFFS_TOUCHWIDGET_HI        =  GUIAPP_OFFS_BEGIN+7
 .equ GUIAPP_OFFS_GUITIMER              =  GUIAPP_OFFS_BEGIN+8
-.equ GUIAPP_SIZE                       =  WIDGET_OFFS_BEGIN+9
+.equ GUIAPP_OFFS_WINDOWSTACK_POS       =  GUIAPP_OFFS_BEGIN+9
+.equ GUIAPP_OFFS_WINDOWSTACK_BEGIN     =  GUIAPP_OFFS_BEGIN+10
+.equ GUIAPP_SIZE                       =  GUIAPP_OFFS_WINDOWSTACK_BEGIN+(GUIAPP_WINDOWSTACK_ENTRIES*2)
 
 
 .equ GUIAPP_GUITIMER = 2
@@ -111,10 +115,6 @@ GuiApp_Init:
   std Y+GUIAPP_OFFS_ROOTWINDOW_LO, xl
   std Y+GUIAPP_OFFS_ROOTWINDOW_HI, xh
 
-; debug
-  std Y+GUIAPP_OFFS_CURRENTWINDOW_LO, xl
-  std Y+GUIAPP_OFFS_CURRENTWINDOW_HI, xh
-
   ldi r16, GUIAPP_GUITIMER
   std Y+GUIAPP_OFFS_GUITIMER, r16
 
@@ -271,7 +271,9 @@ GuiApp_SetRootWindow:
 ; @routine GuiApp_GetCurrentWindow @global
 ;
 ; @param Y address of object in SDRAM
-; @param CFLAG set if response is not a NULL pointer
+; @return CFLAG set if response is not a NULL pointer
+; @return r19:r18 current window
+; @clobbers none
 
 GuiApp_GetCurrentWindow:
   ldd r18, Y+GUIAPP_OFFS_CURRENTWINDOW_LO
@@ -288,20 +290,6 @@ GuiApp_GetCurrentWindow_ret:
 
 
 
-; ---------------------------------------------------------------------------
-; @routine GuiApp_SetCurrentWindow @global
-;
-; @param Y address of object in SDRAM
-; @param X address of new window
-
-GuiApp_SetCurrentWindow:
-  std Y+GUIAPP_OFFS_CURRENTWINDOW_LO, xl
-  std Y+GUIAPP_OFFS_CURRENTWINDOW_HI, xh
-  ret
-; @end
-
-
-
 ; ---------------------------------------------------------------------------
 ; @routine GuiApp_GetScreenSaver @global
 ;
@@ -402,6 +390,173 @@ GuiApp_OnTouch:
 
 
 
+; ---------------------------------------------------------------------------
+; @routine GuiApp_EnterWindow
+; 
+; @param Y address of object in SDRAM
+; @param X main window to enter
+; @return CFLAG set if new window active
+
+GuiApp_EnterWindow:
+  rcall GuiApp_GetCurrentWindow   ; r19:r18=current window
+  brcc GuiApp_EnterWindow_l1      ; jmp if no current window
+  push xl
+    push xh
+      push yl
+        push yh
+          mov yl, r18
+          mov yh, r19
+          ldi r16, WIDGET_SIGNAL_HIDE
+          clr r17
+          bigcall OBJ_TreeHandleSignalChildenFirst
+          mov xl, yl
+          mov xh, yh
+        pop yh
+      pop yl
+      rcall guiAppPushMainWindow  ; push current window onto stack
+    pop xh
+  pop xl
+  brcc GuiApp_EnterWindow_ret
+
+GuiApp_EnterWindow_l1:
+  rcall guiAppSetCurrentWindow
+  push yl
+    push yh
+      mov yl, xl
+      mov yh, xh
+      ldi r16, WIDGET_SIGNAL_SHOW
+      clr r17
+      bigcall OBJ_TreeHandleSignal
+
+    pop yh
+  pop yl
+  sec
+GuiApp_EnterWindow_ret:
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine GuiApp_LeaveWindow
+; 
+; @param Y address of object in SDRAM
+
+GuiApp_LeaveWindow:
+  rcall GuiApp_GetCurrentWindow       ; r19:r18=current window
+  brcc GuiApp_LeaveWindow_ret         ; jmp if no current window
+  push yl
+    push yh
+      mov yl, r18
+      mov yh, r19
+      ldi r16, WIDGET_SIGNAL_HIDE
+      clr r17
+      bigcall OBJ_TreeHandleSignalChildenFirst
+    pop yh
+  pop yl
+GuiApp_LeaveWindow_l1:
+  rcall guiAppPopMainWindow           ; X=popped window
+  brcc GuiApp_LeaveWindow_noPrevious
+  rcall guiAppSetCurrentWindow
+  push yl
+    push yh
+      mov yl, xl
+      mov yh, xh
+      ldi r16, WIDGET_SIGNAL_SHOW
+      clr r17
+      bigcall OBJ_TreeHandleSignal
+    pop yh
+  pop yl
+  rjmp GuiApp_LeaveWindow_ret
+GuiApp_LeaveWindow_noPrevious:
+  clr xl
+  clr xh
+  rcall guiAppSetCurrentWindow
+
+GuiApp_LeaveWindow_ret:
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine guiAppSetCurrentWindow
+;
+; @param Y address of object in SDRAM
+; @param X address of new window
+
+guiAppSetCurrentWindow:
+  std Y+GUIAPP_OFFS_CURRENTWINDOW_LO, xl
+  std Y+GUIAPP_OFFS_CURRENTWINDOW_HI, xh
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine guiAppPushMainWindow
+;
+; @param Y address of object in SDRAM
+; @param X window to push on stack and activate
+; @return CFLAG set if pushed, cleared on error
+
+guiAppPushMainWindow:
+  ldd r16, Y+GUIAPP_OFFS_WINDOWSTACK_POS
+  cpi r16, GUIAPP_WINDOWSTACK_ENTRIES
+  brcc GuiApp_PushMainWindow_ret
+
+  mov zl, yl
+  mov zh, yh
+  adiw zh:zl, GUIAPP_OFFS_WINDOWSTACK_BEGIN
+  clr r17
+  lsl r16
+  rol r17
+  add zl, r16
+  adc zh, r17
+  st Z+, xl
+  st Z, xh
+  ldd r16, Y+GUIAPP_OFFS_WINDOWSTACK_POS
+  inc r16
+  std Y+GUIAPP_OFFS_WINDOWSTACK_POS, r16
+  sec
+GuiApp_PushMainWindow_ret:
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine guiAppPopMainWindow
+;
+; @param Y address of object in SDRAM
+; @return CFLAG set if popped, cleared on error
+; @return X window popped from stack
+
+guiAppPopMainWindow:
+  ldd r16, Y+GUIAPP_OFFS_WINDOWSTACK_POS
+  tst r16
+  clc
+  breq guiAppPopMainWindow_ret
+  dec r16
+  std Y+GUIAPP_OFFS_WINDOWSTACK_POS, r16
+
+  mov zl, yl
+  mov zh, yh
+  adiw zh:zl, GUIAPP_OFFS_WINDOWSTACK_BEGIN
+  clr r17
+  lsl r16
+  rol r17
+  add zl, r16
+  adc zh, r17
+  ld xl, Z+
+  ld xh, Z
+  sec
+guiAppPopMainWindow_ret:
+  ret
+; @end
+
+
+
 
 ; ---------------------------------------------------------------------------
 ; @routine guiAppSendTimerEvents
@@ -432,7 +587,7 @@ guiAppSendTimerEvents:
 guiAppCheckSendGuiEvents:
   push yl
     push yh
-      rcall GuiApp_GetCurrentWindow
+      rcall GuiApp_GetRootWindow
       brcc guiAppCheckSendGuiEvents_done
 
       ldd r16, Y+GUIAPP_OFFS_GUITIMER
@@ -602,7 +757,7 @@ GuiApp_DefaultSignalmap:
   ; header
   .dw Object_DefaultSignalmap*2  ; next table to use
   ; entries
-  .db 0, OBJECT_SIGNAL_TIMER, LOW(GuiApp_OnTimer), HIGH(GuiApp_OnTimer)
+  .db 0, OBJECT_SIGNAL_TIMER,   LOW(GuiApp_OnTimer), HIGH(GuiApp_OnTimer)
   .db 0, OBJECT_SIGNAL_DESTROY, LOW(GuiApp_OnDestroy), HIGH(GuiApp_OnDestroy)
   .db 0, 0, 0, 0  ; end of table
 
diff --git a/avr/modules/lcd2/gui2/base/mainwindow.asm b/avr/modules/lcd2/gui2/base/mainwindow.asm
index 0fbc710..907801a 100644
--- a/avr/modules/lcd2/gui2/base/mainwindow.asm
+++ b/avr/modules/lcd2/gui2/base/mainwindow.asm
@@ -178,12 +178,6 @@ mainWindowCreateTitleWidget:
       std Y+WIDGET_OFFS_STYLE_LO, r16
       ldi r16, HIGH(MainWindow_TitleStyle*2)
       std Y+WIDGET_OFFS_STYLE_HI, r16
-      
-      ; DEBUG
-      ldd r16, Y+OBJECT_OFFS_FLAGS
-      sbr r16, (1<<WIDGET_FLAGS_VISIBLE_BIT) | (1<<WIDGET_FLAGS_LAYOUT_BIT) | (1<<WIDGET_FLAGS_DIRTY_BIT)
-      std Y+OBJECT_OFFS_FLAGS, r16
-      
       sec
 mainWindowCreateTitleWidget_done:
     pop yh
@@ -232,7 +226,6 @@ MainWindow_DefaultSignalmap:
   ; header
   .dw VLayout_DefaultSignalmap*2  ; next table to use
   ; entries
-  .db 0,                           WIDGET_SIGNAL_DRAW,     LOW(Widget_OnDraw),                 HIGH(Widget_OnDraw)
   .db WIDGET_VALUE_DEFAULT_WIDTH,  WIDGET_SIGNAL_GETVALUE, LOW(MainWindow_OnGetDefaultWidth),  HIGH(MainWindow_OnGetDefaultWidth)
   .db WIDGET_VALUE_DEFAULT_HEIGHT, WIDGET_SIGNAL_GETVALUE, LOW(MainWindow_OnGetDefaultHeight), HIGH(MainWindow_OnGetDefaultHeight)
 
@@ -242,7 +235,8 @@ MainWindow_DefaultSignalmap:
 
 MainWindow_DefaultStyle:
   .dw DISPLAY_COLOR_BLACK      ; frontCol_norm
-  .dw DISPLAY_COLOR_LIGHTGREY  ; backCol_norm
+;  .dw DISPLAY_COLOR_LIGHTGREY  ; backCol_norm
+  .dw DISPLAY_COLOR_GREEN      ; backCol_norm
   .dw DISPLAY_COLOR_BLACK      ; borderCol_norm
   .dw DISPLAY_COLOR_WHITE      ; shadowCol_norm
   
@@ -279,7 +273,8 @@ MainWindow_TitleStyle:
 
 MainWindow_ContentStyle:
   .dw DISPLAY_COLOR_BLACK      ; frontCol_norm
-  .dw DISPLAY_COLOR_LIGHTGREY  ; backCol_norm
+;  .dw DISPLAY_COLOR_LIGHTGREY  ; backCol_norm
+  .dw DISPLAY_COLOR_RED        ; backCol_norm
   .dw DISPLAY_COLOR_BLACK      ; borderCol_norm
   .dw DISPLAY_COLOR_WHITE      ; shadowCol_norm
   
diff --git a/avr/modules/lcd2/gui2/base/object.asm b/avr/modules/lcd2/gui2/base/object.asm
index 9083fd8..c710630 100644
--- a/avr/modules/lcd2/gui2/base/object.asm
+++ b/avr/modules/lcd2/gui2/base/object.asm
@@ -589,20 +589,20 @@ OBJ_TreeHandleSignal:
         push r17
           push xl
             push xh
-              rcall OBJ_HandleSignal   ; (any, !Y)
+              rcall OBJ_HandleSignal      ; (any, !Y)
             pop xh
           pop xl
         pop r17
       pop r16
       ; handle children
       rcall OBJ_GetFirstChild             ; r19:r18=object (none)
+      brcc OBJ_TreeHandleSignal_done
 OBJ_TreeHandleSignal_loop:
-        brcc OBJ_TreeHandleSignal_done
         mov yl, r18
         mov yh, r19
         rcall OBJ_TreeHandleSignal        ; recursion!
         rcall OBJ_GetNext                 ; r19:r18=object (none)
-      rjmp OBJ_TreeHandleSignal_loop
+      brcs OBJ_TreeHandleSignal_loop
 OBJ_TreeHandleSignal_done:
     pop yh
   pop yl
diff --git a/avr/modules/lcd2/gui2/base/vlayout.asm b/avr/modules/lcd2/gui2/base/vlayout.asm
index f2ed20b..a118fed 100644
--- a/avr/modules/lcd2/gui2/base/vlayout.asm
+++ b/avr/modules/lcd2/gui2/base/vlayout.asm
@@ -236,6 +236,8 @@ vLayoutHorizontally:
   ; r23:r22=width of host widget
   push yl
     push yh
+      mov xl, yl
+      mov xh, yh
       bigcall OBJ_GetFirstChild
 vLayoutHorizontally_loop:
         brcc vLayoutHorizontally_loopEnd
@@ -254,7 +256,13 @@ vLayoutHorizontally_loop:
 vLayoutHorizontally_setWidth:
         std Y+WIDGET_OFFS_WIDTH_LO, r12
         std Y+WIDGET_OFFS_WIDTH_HI, r13
-        rcall Widget_PackSelfX                ; R5:R4=new pos (r17, r18, r19, r20, r21)
+        push yl
+          push yh
+            mov yl, xl
+            mov yh, xh
+            rcall Widget_PackSelfX                ; R5:R4=new pos (r17, r18, r19, r20, r21)
+          pop yh
+        pop yl  
         std Y+WIDGET_OFFS_X_LO, r4
         std Y+WIDGET_OFFS_X_HI, r5
         rcall OBJ_GetNext
diff --git a/avr/modules/lcd2/gui2/base/widget.asm b/avr/modules/lcd2/gui2/base/widget.asm
index d42675a..803e427 100644
--- a/avr/modules/lcd2/gui2/base/widget.asm
+++ b/avr/modules/lcd2/gui2/base/widget.asm
@@ -193,6 +193,11 @@ Widget_Init_setDefaultSize:
   or r16, xh
   breq Widget_Init_ret
   bigcall OBJ_AddChild                   ; (r18, r19)
+  ; parent needs to layout with the new child
+  adiw xh:xl, OBJECT_OFFS_FLAGS
+  ld r16, X
+  sbr r16, (1<<WIDGET_FLAGS_LAYOUT_BIT)
+  sbiw xh:xl, OBJECT_OFFS_FLAGS
 
   ; preset flags
   ldd r16, Y+OBJECT_OFFS_FLAGS
@@ -401,6 +406,40 @@ Widget_OnLayout:
 ; @end
 
 
+
+; ---------------------------------------------------------------------------
+; @routine Widget_OnShow @global
+;
+; @param Y address of widget
+; @return CFLAG set if signal handled
+; @clobbers any, !Y
+
+Widget_OnShow:
+  ldd r16, Y+OBJECT_OFFS_FLAGS
+  sbr r16, (1<<WIDGET_FLAGS_VISIBLE_BIT) | (1<<WIDGET_FLAGS_DIRTY_BIT) | (1<<WIDGET_FLAGS_LAYOUT_BIT)
+  std Y+OBJECT_OFFS_FLAGS, r16
+  sec
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine Widget_OnHide @global
+;
+; @param Y address of widget
+; @return CFLAG set if signal handled
+; @clobbers any, !Y
+
+Widget_OnHide:
+  ldd r16, Y+OBJECT_OFFS_FLAGS
+  cbr r16, (1<<WIDGET_FLAGS_VISIBLE_BIT)
+  std Y+OBJECT_OFFS_FLAGS, r16
+  sec
+  ret
+; @end
+
+
 ; ---------------------------------------------------------------------------
 ; @routine Widget_OnGetValue @global
 ;
@@ -1023,14 +1062,14 @@ widgetPack:
   sub r18, r20                   ; subtract border at begin
   sbc r19, r21
   sub r18, r20                   ; subtract border at end
-  sbc r19, r21
+  sbc r19, r21                   ; r19:r18=host size - (border*2)
 
   andi r17, 3                    ; only 2 bits pack mode
   cpi r17, WIDGET_PACK_END
   breq widgetPack_end
   cpi r17, WIDGET_PACK_CENTER
   breq widgetPack_center
-  rjmp widgetPack_ret     ; begin/filled, align at begin
+  rjmp widgetPack_ret            ; begin/filled, align at begin
 widgetPack_end:
   sub r18, r12
   sbc r19, r13
@@ -1063,6 +1102,8 @@ Widget_DefaultSignalmap:
   .db 0, WIDGET_SIGNAL_DRAW,     LOW(Widget_OnDraw),     HIGH(Widget_OnDraw)
   .db 0, WIDGET_SIGNAL_LAYOUT,   LOW(Widget_OnLayout),   HIGH(Widget_OnLayout)
   .db 0, WIDGET_SIGNAL_GETVALUE, LOW(Widget_OnGetValue), HIGH(Widget_OnGetValue)  ; handle any value here
+  .db 0, WIDGET_SIGNAL_SHOW,     LOW(Widget_OnShow),     HIGH(Widget_OnShow)
+  .db 0, WIDGET_SIGNAL_HIDE,     LOW(Widget_OnHide),     HIGH(Widget_OnHide)
   .db 0, 0, 0, 0  ; end of table