diff --git a/singlehandle_windows.c b/singlehandle_windows.c
index a6e3960f..74dee5f8 100644
--- a/singlehandle_windows.c
+++ b/singlehandle_windows.c
@@ -4,30 +4,36 @@
 // Common code for controls with a single window handle.
 // The only method NOT defined is preferredSize(); this differs between controls.
 
+#define S(c) ((uiSingleHWNDControl *) (c))
+
 static uintptr_t singleHandle(uiControl *c)
 {
-	return (uintptr_t) (c->hwnd);
+	return (uintptr_t) (S(c)->hwnd);
 }
 
-//TODO	void (*setParent)(uiControl *, uintptr_t);
+void singleSetParent(uiControl *c, uintptr_t parentHWND)
+{
+	if (SetParent(S(c)->hwnd, (HWND) parentHWND) == NULL)
+		logLastError("error changing control parent in singleSetParent()");
+}
 
 static void singleResize(uiControl *c, intmax_t x, intmax_t y, intmax_t width, intmax_t height, uiSizing *d)
 {
-	if (MoveWindow(c->hwnd, x, y, width, height, TRUE) == 0)
+	if (MoveWindow(S(c)->hwnd, x, y, width, height, TRUE) == 0)
 		logLastError("error moving control in singleResize()");
 }
 
 static void singleContainerShow(uiControl *c)
 {
-	ShowWindow(c->hwnd, SW_SHOW);
+	ShowWindow(S(c)->hwnd, SW_SHOW);
 }
 
 static void singleContainerHide(uiControl *c)
 {
-	ShowWindow(c->hwnd, SW_HIDE);
+	ShowWindow(S(c)->hwnd, SW_HIDE);
 }
 
-uiSingleHWNDControl *newSingleHWNDControl(DWORD exstyle, const WCHAR *class, DWORD style, HWND parent, HINSTANCE hInstance)
+uiSingleHWNDControl *newSingleHWNDControl(DWORD exstyle, const WCHAR *class, DWORD style, HINSTANCE hInstance)
 {
 	uiSingleHWNDControl *c;
 
@@ -38,12 +44,12 @@ uiSingleHWNDControl *newSingleHWNDControl(DWORD exstyle, const WCHAR *class, DWO
 		0, 0,
 		100, 100,
 		// TODO specify control IDs properly
-		parent, NULL, hInstance, NULL);
+		initialParent, NULL, hInstance, NULL);
 	if (c->hwnd == NULL)
 		logLastError("error creating control in newSingleHWNDControl()");
 
 	c->control.handle = singleHandle;
-//TODO	c->control.setParent = singleSetParent;
+	c->control.setParent = singleSetParent;
 	c->control.resize = singleResize;
 	c->control.containerShow = singleContainerShow;
 	c->control.containerHide = singleContainerHide;
diff --git a/ui_windows.h b/ui_windows.h
index 00a14c8b..896762f5 100644
--- a/ui_windows.h
+++ b/ui_windows.h
@@ -47,6 +47,7 @@ extern HRESULT logMemoryExhausted(const char *);
 extern HINSTANCE hInstance;
 extern int nCmdShow;
 extern HFONT hMessageFont;
+extern HWND initialParent;
 
 // util_windows.c
 extern WCHAR *toUTF16(const char *);
@@ -62,6 +63,6 @@ struct uiSingleHWNDControl {
 	void (*voidEvent)(uiControl *, void *);
 	void *voidEventData;
 };
-extern uiSingleHWNDControl *newSingleHWNDControl(DWORD, const WCHAR *, DWORD, HWND, HINSTANCE);
+extern uiSingleHWNDControl *newSingleHWNDControl(DWORD, const WCHAR *, DWORD, HINSTANCE);
 
 #endif
diff --git a/uipriv.h b/uipriv.h
index 002adf02..02aa72b3 100644
--- a/uipriv.h
+++ b/uipriv.h
@@ -12,7 +12,7 @@ struct uiSize {
 // TODO handle destruction
 struct uiControl {
 	uintptr_t (*handle)(uiControl *);
-//TODO	void (*setParent)(uiControl *, uintptr_t);
+	void (*setParent)(uiControl *, uintptr_t);
 	uiSize (*preferredSize)(uiControl *, uiSizing *);
 	void (*resize)(uiControl *, intmax_t, intmax_t, intmax_t, intmax_t, uiSizing *);
 	void (*containerShow)(uiControl *);