diff --git a/TODO.md b/TODO.md
index 1ee8a990..7026274a 100644
--- a/TODO.md
+++ b/TODO.md
@@ -1,5 +1,3 @@
-- 32-bit Mac OS X support (requires lots of code changes)
-- add a test for hidden controls when a window is shown
 - SWP_NOCOPYBITS (or was it WS_CLIPCHILDREN?)
 	- buttons not in tab get drawover issues
 	- buttons in tab without transparent drawing code get copied into the label when stack shown and rehidden
@@ -57,6 +55,8 @@
 		- we control resizes of all children so we can reliably update after a resize
 		- we already need to do this in uiContainer :/
 - make it so Windows API calls that do logLastError(), etc. abort whatever they're doing and not try to continue, just like wintable
+- 32-bit Mac OS X support (requires lots of code changes)
+	- change the build system to be more receptive to arch changes
 
 ultimately:
 - add some sort of runtime type checking
diff --git a/box.c b/box.c
index 8918b2d7..5ab1e6c9 100644
--- a/box.c
+++ b/box.c
@@ -74,6 +74,7 @@ static void boxPreferredSize(uiControl *c, uiSizing *d, intmax_t *width, intmax_
 	}
 
 	// 1) initialize the desired rect with the needed padding
+	// TODO this is wrong if any controls are hidden
 	if (b->vertical)
 		*height = (b->len - 1) * ypadding;
 	else
@@ -145,6 +146,7 @@ static void boxResizeChildren(uiContainer *c, intmax_t x, intmax_t y, intmax_t w
 	}
 
 	// 0) inset the available rect by the needed padding
+	// TODO this is incorrect if any controls are hidden
 	if (b->vertical)
 		height -= (b->len - 1) * ypadding;
 	else
diff --git a/test/page2.c b/test/page2.c
index 8385a8d9..fbbf015e 100644
--- a/test/page2.c
+++ b/test/page2.c
@@ -47,6 +47,7 @@ static void openAnotherWindow(uiButton *b, void *data)
 	{ \
 		uiControl ## Method(uiControl(data)); \
 	}
+SHED(show, Show)
 SHED(enable, Enable)
 SHED(disable, Disable)
 
@@ -71,6 +72,7 @@ uiBox *makePage2(void)
 	uiTab *disabledTab;
 	uiEntry *entry;
 	uiEntry *readonly;
+	uiButton *button2;
 
 	page2 = newVerticalBox();
 
@@ -162,5 +164,14 @@ uiBox *makePage2(void)
 	uiBoxAppend(page2, uiControl(entry), 0);
 	uiBoxAppend(page2, uiControl(readonly), 0);
 
+	hbox = newHorizontalBox();
+	button = uiNewButton("Show Button 2");
+	button2 = uiNewButton("Button 2");
+	uiButtonOnClicked(button, showControl, button2);
+	uiControlHide(uiControl(button2));
+	uiBoxAppend(hbox, uiControl(button), 1);
+	uiBoxAppend(hbox, uiControl(button2), 0);
+	uiBoxAppend(page2, uiControl(hbox), 0);
+
 	return page2;
 }