diff --git a/ueforth/common/grf_test.fs b/ueforth/common/grf_test.fs
index 00690c5..a36f183 100644
--- a/ueforth/common/grf_test.fs
+++ b/ueforth/common/grf_test.fs
@@ -14,15 +14,35 @@
 
 grf
 
+$00ccff value color
+
+: hline { x y w }
+  x y pixel w 1- for color over l! 4 + next drop ;
+
+: box { left top w h }
+  left w + top h + { right bottom }
+  left 0 max to left
+  top 0 max to top
+  right width min to right
+  bottom height min to bottom
+  left right >= top bottom >= if exit then
+  right left - to w
+  bottom top - to h
+  top h 1- for left over w hline 1+ next
+;
+
+0 value clicking
+
 640 480 window
 : run
   begin
     wait
-    100 0 do
-      50 0 do
-        $ffcc00 i j pixel l!
-      loop
-    loop
+    PRESSED event = if 1 to clicking then
+    RELEASED event = if 0 to clicking then
+    0 to color
+    0 0 width height box
+    clicking if $00ccff else $ffcc00 then to color
+    mouse-x 100 - mouse-y 50 - 200 100 box
     flip
   event FINISHED = until
   bye
diff --git a/ueforth/windows/grf.fs b/ueforth/windows/grf.fs
index 09e7cc8..16a8586 100644
--- a/ueforth/windows/grf.fs
+++ b/ueforth/windows/grf.fs
@@ -38,7 +38,7 @@ cell allocate throw to backbuffer
   binfo BITMAPINFO erase
   BITMAPINFOHEADER binfo ->bmiHeader ->biSize !
   w binfo ->bmiHeader ->biWidth !
-  h binfo ->bmiHeader ->biHeight !
+  h negate binfo ->bmiHeader ->biHeight !
   1 binfo ->bmiHeader ->biPlanes !
   32 binfo ->bmiHeader ->biBitCount !
   BI_RGB binfo ->bmiHeader ->biCompression !
@@ -66,13 +66,9 @@ cell allocate throw to backbuffer
     0 exit
   then
   WM_KEYDOWN msg = if
-    l GET_X_LPARAM to mouse-x
-    l GET_Y_LPARAM to mouse-y
     PRESSED to event
   then
   WM_KEYUP msg = if
-    l GET_X_LPARAM to mouse-x
-    l GET_Y_LPARAM to mouse-y
     RELEASED to event
   then
   WM_CHAR msg = if
@@ -91,6 +87,7 @@ cell allocate throw to backbuffer
     l GET_X_LPARAM to mouse-x
     l GET_Y_LPARAM to mouse-y
     MOTION to event
+    0 exit
   then
   hwnd msg w l DefWindowProcA
 ;
@@ -100,6 +97,9 @@ also internals
 also windows
 
 : window { width height }
+  width 0< { fullscreen }
+  fullscreen if 640 to width 480 to height then
+
   NULL GetModuleHandleA to hinstance
   1 1 rescale
 
@@ -118,7 +118,8 @@ also windows
 
   hwnd GetDC to hdc
 
-  hwnd SW_SHOWMAXIMIZED ShowWindow drop
+  fullscreen if SW_SHOWMAXIMIZED else SW_SHOWDEFAULT then
+  hwnd swap ShowWindow drop
   hwnd SetForegroundWindow drop
 ;