diff --git a/haiku/GNUmakeinc.mk b/haiku/GNUmakeinc.mk
index 26d2ac19..5ce1001e 100644
--- a/haiku/GNUmakeinc.mk
+++ b/haiku/GNUmakeinc.mk
@@ -18,6 +18,7 @@ CXXFILES += \
 	haiku/progressbar.cpp \
 	haiku/radiobuttons.cpp \
 	haiku/separator.cpp \
+	haiku/singlechild.cpp \
 	haiku/slider.cpp \
 	haiku/spinbox.cpp \
 	haiku/stddialogs.cpp \
diff --git a/haiku/singlechild.cpp b/haiku/singlechild.cpp
new file mode 100644
index 00000000..c77e8650
--- /dev/null
+++ b/haiku/singlechild.cpp
@@ -0,0 +1,79 @@
+// 19 november 2015
+#include "uipriv_haiku.hpp"
+
+// singlechild.cpp is like child.c/child.m in the other ports, except it only handles single children with an optional margin.
+
+struct singleChild {
+	uiControl *c;
+	BView *view;
+	BGroupLayout *box;
+	BLayoutItem *item;
+	BAlignment oldalign;
+};
+
+struct singleChild *newSingleChild(uiControl *c, uiControl *parent, void (*attach)(void *, BLayoutItem *), void *attachTo)
+{
+	struct singleChild *s;
+
+	if (c == NULL)
+		return NULL;
+
+	s = uiNew(struct singleChild);
+	s->c = c;
+	s->view = (BView *) uiControlHandle(s->c);
+	s->oldalign = s->view->ExplicitAlignment();
+
+	uiControlSetParent(s->c, parent);
+
+	s->box = new BGroupLayout(B_HORIZONTAL, 0);
+	// TODO TODO TODO TODO
+	// currently BLayout won't let you add a view to a layout that isn't attached to a view
+	// that is, if you want to add a view to a layout, there must already be a parent view
+	// request this behavior to be changed
+	(*attach)(attachTo, s->box);
+
+	s->view->SetExplicitAlignment(BAlignment(B_ALIGN_USE_FULL_WIDTH, B_ALIGN_USE_FULL_HEIGHT));
+	s->item = s->box->AddView(s->view, 1.0);
+
+	// and set it on the box as well
+	// this way it fills the entire space
+	s->box->SetExplicitAlignment(BAlignment(B_ALIGN_USE_FULL_WIDTH, B_ALIGN_USE_FULL_HEIGHT));
+
+	return s;
+}
+
+void singleChildRemove(struct singleChild *s)
+{
+	s->box->RemoveItem(s->item);
+	delete s->item;
+	delete s->box;
+	uiControlSetParent(s->c, NULL);
+	s->view->SetExplicitAlignment(s->oldalign);
+	uiFree(s);
+}
+
+void singleChildDestroy(struct singleChild *s)
+{
+	uiControl *child;
+
+	child = s->c;
+	singleChildRemove(s);
+	uiControlDestroy(child);
+}
+
+// this is of the box itself, not of the child
+// it is used to add the child to the parent layout
+BLayoutItem *singleChildLayoutItem(struct singleChild *s)
+{
+	return s->box;
+}
+
+void singleChildUpdateState(struct singleChild *s)
+{
+	controlUpdateState(s->c);
+}
+
+void singleChildSetMargined(struct singleChild *s, float inset)
+{
+	s->box->SetInsets(inset, inset, inset, inset);
+}
diff --git a/haiku/tab.cpp b/haiku/tab.cpp
index f02ff8b9..8933dac5 100644
--- a/haiku/tab.cpp
+++ b/haiku/tab.cpp
@@ -3,13 +3,13 @@
 
 struct uiTab {
 	uiHaikuControl c;
-	BStringView *dummy;
+	BTabView *tabview;
 };
 
 uiHaikuDefineControl(
 	uiTab,								// type name
 	uiTabType,							// type function
-	dummy								// handle
+	tabview								// handle
 )
 
 void uiTabAppend(uiTab *t, const char *name, uiControl *c)
@@ -50,8 +50,7 @@ uiTab *uiNewTab(void)
 
 	t = (uiTab *) uiNewControl(uiTabType());
 
-	t->dummy = new BStringView(BRect(0, 0, 1, 1), NULL,
-		"TODO uiTab not implemented");
+	t->tabview = new BTabView(BRect(0, 0, 1, 1), NULL);
 
 	uiHaikuFinishNewControl(t, uiTab);
 
diff --git a/haiku/uipriv_haiku.hpp b/haiku/uipriv_haiku.hpp
index 57e0f60a..9b6c3466 100644
--- a/haiku/uipriv_haiku.hpp
+++ b/haiku/uipriv_haiku.hpp
@@ -7,6 +7,14 @@
 #include "../ui_haiku.hpp"
 #include "../common/uipriv.h"
 
-// alloc.c
+// alloc.cpp
 extern void initAlloc(void);
 extern void uninitAlloc(void);
+
+// singlechild.cpp
+extern struct singleChild *newSingleChild(uiControl *c, uiControl *parent, void (*attach)(void *, BLayoutItem *), void *attachTo);
+extern void singleChildRemove(struct singleChild *s);
+extern void singleChildDestroy(struct singleChild *s);
+extern BLayoutItem *singleChildLayoutItem(struct singleChild *s);
+extern void singleChildUpdateState(struct singleChild *s);
+extern void singleChildSetMargined(struct singleChild *s, float inset);
diff --git a/haiku/window.cpp b/haiku/window.cpp
index b9bf5fa6..5bdf220d 100644
--- a/haiku/window.cpp
+++ b/haiku/window.cpp
@@ -17,9 +17,7 @@ struct uiWindow {
 
 	BGroupLayout *vbox;
 
-	uiControl *child;
-	BGroupLayout *childBox;
-	BLayoutItem *childItem;
+	struct singleChild *child;
 	int margined;
 
 	int (*onClosing)(uiWindow *, void *);
@@ -55,12 +53,8 @@ static void windowCommitDestroy(uiControl *c)
 	// first hide ourselves
 	w->window->Hide();
 	// now destroy the child
-	if (w->child != NULL) {
-		w->childBox->RemoveItem(w->childItem);
-		delete w->childItem;
-		uiControlSetParent(w->child, NULL);
-		uiControlDestroy(w->child);
-	}
+	if (w->child != NULL)
+		singleChildDestroy(w->child);
 	// and finally destroy ourselves
 	// this is why we don't use the libui-provided CommitDestroy() implementation
 	// TODO check this for errors?
@@ -87,12 +81,10 @@ static void windowCommitHide(uiControl *c)
 
 static void windowContainerUpdateState(uiControl *c)
 {
-/*TODO
 	uiWindow *w = uiWindow(c);
 
 	if (w->child != NULL)
-		childUpdateState(w->child);
-*/
+		singleChildUpdateState(w->child);
 }
 
 char *uiWindowTitle(uiWindow *w)
@@ -112,17 +104,23 @@ void uiWindowOnClosing(uiWindow *w, int (*f)(uiWindow *, void *), void *data)
 	w->onClosingData = data;
 }
 
-// TODO save and restore old alignment
+// see singlechild.cpp
+static void attach(void *attachTo, BLayoutItem *what)
+{
+	BGroupLayout *vbox = (BGroupLayout *) attachTo;
+
+	vbox->AddItem(what);
+}
+
 void uiWindowSetChild(uiWindow *w, uiControl *child)
 {
 	if (w->child != NULL) {
-		w->childBox->RemoveItem(w->childItem);
-		delete w->childItem;
-		uiControlSetParent(w->child, NULL);
+		w->vbox->RemoveItem(singleChildLayoutItem(w->child));
+		singleChildRemove(w->child);
 	}
-	w->child = child;
+	w->child = newSingleChild(child, uiControl(w), attach, w->vbox);
 	if (w->child != NULL)
-		w->childItem = w->childBox->AddView((BView *) uiControlHandle(w->child));
+		uiWindowSetMargined(w, w->margined);
 }
 
 int uiWindowMargined(uiWindow *w)
@@ -133,13 +131,11 @@ int uiWindowMargined(uiWindow *w)
 void uiWindowSetMargined(uiWindow *w, int margined)
 {
 	w->margined = margined;
-	if (w->margined)
-		w->childBox->SetInsets(B_USE_WINDOW_SPACING,
-			B_USE_WINDOW_SPACING,
-			B_USE_WINDOW_SPACING,
-			B_USE_WINDOW_SPACING);
-	else
-		w->childBox->SetInsets(0, 0, 0, 0);
+	if (w->child != NULL)
+		if (w->margined)
+			singleChildSetMargined(w->child, B_USE_WINDOW_SPACING);
+		else
+			singleChildSetMargined(w->child, 0);
 }
 
 uiWindow *uiNewWindow(const char *title, int width, int height, int hasMenubar)
@@ -162,11 +158,6 @@ uiWindow *uiNewWindow(const char *title, int width, int height, int hasMenubar)
 	// Haiku itself does this, with a TODO
 	w->vbox->Owner()->SetViewColor(ui_color(B_PANEL_BACKGROUND_COLOR));
 
-	w->childBox = new BGroupLayout(B_HORIZONTAL, 0);
-	w->childBox->SetExplicitAlignment(BAlignment(B_ALIGN_USE_FULL_WIDTH, B_ALIGN_USE_FULL_HEIGHT));
-	w->childBox->SetInsets(0, 0, 0, 0);
-	w->vbox->AddItem(w->childBox, 1.0);
-
 	uiWindowOnClosing(w, defaultOnClosing, NULL);
 
 	uiHaikuFinishNewControl(w, uiWindow);