diff --git a/redo/unix/GNUmakeinc.mk b/redo/unix/GNUmakeinc.mk
index d2080e03..607b4447 100644
--- a/redo/unix/GNUmakeinc.mk
+++ b/redo/unix/GNUmakeinc.mk
@@ -2,6 +2,7 @@
 
 osCFILES = \
 	unix/alloc.c \
+	unix/bin.c \
 	unix/box.c \
 	unix/button.c \
 	unix/checkbox.c \
diff --git a/redo/unix/bin.c b/redo/unix/bin.c
new file mode 100644
index 00000000..ddb3470d
--- /dev/null
+++ b/redo/unix/bin.c
@@ -0,0 +1,82 @@
+// 30 june 2015
+#include "uipriv_unix.h"
+
+// This is a uiControl wrapper a la GtkBin.
+// It serves the function of tabPage on Windows: it allows uiWindow and uiTab to give their children a real uiControl as a parent while not screwing with the internal GtkWidget structure of those uiControls.
+// It also provides margins.
+
+struct bin {
+	uiControl c;
+	GtkWidget *widget;
+	GtkContainer *container;
+	GtkBox *box;		// GtkBin is abstract and none of the implementations seem adequate (GtkFrame is the closest but eh)
+	uiControl *child;
+	int margined;
+};
+
+uiDefineControlType(bin, binType, struct bin)
+
+static uintptr_t binHandle(uiControl *c)
+{
+	struct bin *b = (struct bin *) c;
+
+	return (uintptr_t) (b->widget);
+}
+
+uiControl *newBin(void)
+{
+	struct bin *b;
+
+	b = (struct bin *) uiNewControl(binType());
+
+	b->widget = gtk_box_new(GTK_ORIENTATION_HORIZONTAL, 0);
+	b->container = GTK_CONTAINER(b->widget);
+	b->box = GTK_BOX(b->widget);
+	uiUnixMakeSingleWidgetControl(uiControl(b), b->widget);
+
+	// a uiBox is theoretically used in a context where this shouldn't be necessary but because of uiWindow we'll do it anyway
+	gtk_widget_set_hexpand(b->widget, TRUE);
+	gtk_widget_set_halign(b->widget, GTK_ALIGN_FILL);
+	gtk_widget_set_vexpand(b->widget, TRUE);
+	gtk_widget_set_valign(b->widget, GTK_ALIGN_FILL);
+
+	uiControl(b)->Handle = binHandle;
+
+	return uiControl(b);
+}
+
+void binSetChild(uiControl *c, uiControl *child)
+{
+	struct bin *b = (struct bin *) c;
+	GtkWidget *childWidget;
+
+	if (b->child != NULL)
+		uiControlSetParent(b->child, NULL);
+	b->child = child;
+	if (b->child != NULL) {
+		uiControlSetParent(b->child, uiControl(b));
+		childWidget = GTK_WIDGET(uiControlHandle(b->child));
+		gtk_widget_set_hexpand(childWidget, TRUE);
+		gtk_widget_set_halign(childWidget, GTK_ALIGN_FILL);
+		gtk_widget_set_vexpand(childWidget, TRUE);
+		gtk_widget_set_valign(childWidget, GTK_ALIGN_FILL);
+	}
+}
+
+int binMargined(uiControl *c)
+{
+	struct bin *b = (struct bin *) c;
+
+	return b->margined;
+}
+
+void binSetMargined(uiControl *c, int margined)
+{
+	struct bin *b = (struct bin *) c;
+
+	b->margined = margined;
+	if (b->margined)
+		gtk_container_set_border_width(b->container, gtkXMargin);
+	else
+		gtk_container_set_border_width(b->container, 0);
+}
diff --git a/redo/unix/uipriv_unix.h b/redo/unix/uipriv_unix.h
index 79d151ba..64faf5e2 100644
--- a/redo/unix/uipriv_unix.h
+++ b/redo/unix/uipriv_unix.h
@@ -22,5 +22,11 @@ extern void uninitMenus(void);
 extern void initAlloc(void);
 extern void uninitAlloc(void);
 
+// bin.c
+extern uiControl *newBin(void);
+extern void binSetChild(uiControl *, uiControl *);
+extern int binMargined(uiControl *);
+extern void binSetMargined(uiControl *, int);
+
 // TODO
 #define PUT_CODE_HERE 0
diff --git a/redo/unix/window.c b/redo/unix/window.c
index 7e6b75c2..66840bb9 100644
--- a/redo/unix/window.c
+++ b/redo/unix/window.c
@@ -16,11 +16,11 @@ struct window {
 
 	GtkWidget *menubar;
 
+	uiControl *bin;
 	uiControl *child;
 
 	int (*onClosing)(uiWindow *, void *);
 	void *onClosingData;
-	int margined;
 	void (*baseCommitDestroy)(uiControl *c);
 };
 
@@ -49,8 +49,10 @@ static void windowCommitDestroy(uiControl *c)
 	// first hide ourselves
 	gtk_widget_hide(w->widget);
 	// now destroy the child
-	uiControlSetParent(w->child, NULL);
+	binSetChild(w->bin, NULL);
 	uiControlDestroy(w->child);
+	// and destroy the bin
+	uiControlDestroy(w->bin);
 	// now destroy the menus, if any
 	if (w->menubar != NULL)
 		freeMenubar(w->menubar);
@@ -112,32 +114,24 @@ static void windowSetChild(uiWindow *ww, uiControl *child)
 	struct window *w = (struct window *) ww;
 
 	if (w->child != NULL)
-		uiControlSetParent(w->child, NULL);
+		binSetChild(w->bin, NULL);
 	w->child = child;
-	if (w->child != NULL) {
-//TODO		uiControlSetParent(w->child, w->child);
-		gtk_widget_set_hexpand(GTK_WIDGET(uiControlHandle(w->child)), TRUE);
-		gtk_widget_set_halign(GTK_WIDGET(uiControlHandle(w->child)), GTK_ALIGN_FILL);
-		gtk_widget_set_vexpand(GTK_WIDGET(uiControlHandle(w->child)), TRUE);
-		gtk_widget_set_valign(GTK_WIDGET(uiControlHandle(w->child)), GTK_ALIGN_FILL);
-		gtk_container_add(w->vboxContainer, GTK_WIDGET(uiControlHandle(w->child)));
-		uiControlQueueResize(w->child);
-	}
+	if (w->child != NULL)
+		binSetChild(w->bin, w->child);
 }
 
 static int windowMargined(uiWindow *ww)
 {
 	struct window *w = (struct window *) ww;
 
-	return w->margined;
+	return binMargined(w->bin);
 }
 
 static void windowSetMargined(uiWindow *ww, int margined)
 {
 	struct window *w = (struct window *) ww;
 
-	w->margined = margined;
-	// TODO
+	binSetMargined(w->bin, margined);
 	uiControlQueueResize(uiControl(w));
 }
 
@@ -178,6 +172,9 @@ uiWindow *uiNewWindow(const char *title, int width, int height, int hasMenubar)
 		gtk_container_add(w->vboxContainer, w->menubar);
 	}
 
+	w->bin = newBin();
+	gtk_container_add(w->vboxContainer, GTK_WIDGET(uiControlHandle(w->bin)));
+
 	// show everything in the vbox, but not the GtkWindow itself
 	gtk_widget_show_all(w->vboxWidget);