diff --git a/haiku/progressbar.cpp b/haiku/progressbar.cpp
index e212c810..b1639155 100644
--- a/haiku/progressbar.cpp
+++ b/haiku/progressbar.cpp
@@ -3,18 +3,19 @@
 
 struct uiProgressBar {
 	uiHaikuControl c;
-	BStringView *dummy;
+	BStatusBar *pbar;
 };
 
 uiHaikuDefineControl(
 	uiProgressBar,							// type name
 	uiProgressBarType,						// type function
-	dummy								// handle
+	pbar									// handle
 )
 
 void uiProgressBarSetValue(uiProgressBar *p, int n)
 {
-	// TODO
+	// not on api.haiku-os.org
+	p->pbar->SetTo(n);
 }
 
 uiProgressBar *uiNewProgressBar(void)
@@ -23,7 +24,8 @@ uiProgressBar *uiNewProgressBar(void)
 
 	p = (uiProgressBar *) uiNewControl(uiProgressBarType());
 
-	p->dummy = new BStringView(NULL, "TODO uiProgressBar not implemented");
+	// layout constructor; not on api.haiku-os.org
+	p->pbar = new BStatusBar(NULL, NULL, NULL);
 
 	uiHaikuFinishNewControl(p, uiProgressBar);
 
diff --git a/haiku/slider.cpp b/haiku/slider.cpp
index e04304d7..fa040f07 100644
--- a/haiku/slider.cpp
+++ b/haiku/slider.cpp
@@ -1,40 +1,72 @@
 // 18 november 2015
 #include "uipriv_haiku.hpp"
 
+// TODO any of this on api.haiku-os.org?
+// TODO tracking events?
+
 struct uiSlider {
 	uiHaikuControl c;
-	BStringView *dummy;
+	BSlider *slider;
+	void (*onChanged)(uiSlider *, void *);
+	void *onChangedData;
 };
 
 uiHaikuDefineControl(
 	uiSlider,								// type name
 	uiSliderType,							// type function
-	dummy								// handle
+	slider								// handle
 )
 
+#define mSliderChanged 0x6060FEFE
+
+static void onChanged(BMessage *msg)
+{
+	void *ss;
+	uiSlider *s;
+
+	// TODO error check
+	msg->FindPointer(mControlField, &ss);
+	s = uiSlider(ss);
+	(*(s->onChanged))(s, s->onChangedData);
+}
+
+static void defaultOnChanged(uiSlider *s, void *data)
+{
+	// do nothing
+}
+
 intmax_t uiSliderValue(uiSlider *s)
 {
-	// TODO
-	return 0;
+	return s->slider->Value();
 }
 
 void uiSliderSetValue(uiSlider *s, intmax_t value)
 {
-	// TODO
+	// TODO does this trigger an event?
+	s->slider->SetValue(value);
 }
 
 void uiSliderOnChanged(uiSlider *s, void (*f)(uiSlider *s, void *data), void *data)
 {
-	// TODO
+	s->onChanged = f;
+	s->onChangedData = data;
 }
 
 uiSlider *uiNewSlider(intmax_t min, intmax_t max)
 {
 	uiSlider *s;
+	BMessage *msg;
 
 	s = (uiSlider *) uiNewControl(uiSliderType());
 
-	s->dummy = new BStringView(NULL, "TODO uiSlider not implemented");
+	uiHaikuRegisterEventHandler(mSliderChanged, onChanged);
+	msg = new BMessage(mSliderChanged);
+	msg->AddPointer(mControlField, s);
+
+	s->slider = new BSlider(NULL, NULL, msg,
+		min, max, B_HORIZONTAL);
+
+	uiSliderOnChanged(s, defaultOnChanged, NULL);
 
 	uiHaikuFinishNewControl(s, uiSlider);