diff --git a/darwin/combobox.m b/darwin/combobox.m
index cc2f330a..9cf7f925 100644
--- a/darwin/combobox.m
+++ b/darwin/combobox.m
@@ -81,6 +81,21 @@ void uiComboboxAppend(uiCombobox *c, const char *text)
 	[c->pbac addObject:uiprivToNSString(text)];
 }
 
+void uiComboboxInsertAt(uiCombobox *c, int n, const char *text)
+{
+	[c->pbac insert:uiprivToNSString(text) atArrangedObjectIndex:n];
+}
+
+void uiComboboxDelete(uiCombobox *c, int n)
+{
+	[c->pb removeItemAtIndex:n];
+}
+
+void uiComboboxClear(uiCombobox *c)
+{
+	[c->pb removeAllItems];
+}
+
 int uiComboboxSelected(uiCombobox *c)
 {
 	return [c->pb indexOfSelectedItem];
diff --git a/test/page4.c b/test/page4.c
index ce4a6afb..4c683574 100644
--- a/test/page4.c
+++ b/test/page4.c
@@ -39,6 +39,21 @@ static void appendCBRB(uiButton *b, void *data)
 	uiRadioButtonsAppend(rb, "New Item");
 }
 
+static void insertCB(uiButton *b, void *data)
+{
+	uiComboboxInsertAt(cbox, 0, "Inserted item");
+}
+
+static void deleteCB(uiButton *b, void *data)
+{
+	uiComboboxDelete(cbox, 0);
+}
+
+static void clearCB(uiButton *b, void *data)
+{
+	uiComboboxClear(cbox);
+}
+
 static void onCBChanged(uiCombobox *c, void *data)
 {
 	printf("%s combobox changed to %d\n",
@@ -147,6 +162,15 @@ uiBox *makePage4(void)
 	b = uiNewButton("Append");
 	uiButtonOnClicked(b, appendCBRB, NULL);
 	uiBoxAppend(hbox, uiControl(b), 0);
+	b = uiNewButton("Insert");
+	uiButtonOnClicked(b, insertCB, NULL);
+	uiBoxAppend(hbox, uiControl(b), 0);
+	b = uiNewButton("Delete");
+	uiButtonOnClicked(b, deleteCB, NULL);
+	uiBoxAppend(hbox, uiControl(b), 0);
+	b = uiNewButton("Clear");
+	uiButtonOnClicked(b, clearCB, NULL);
+	uiBoxAppend(hbox, uiControl(b), 0);
 	b = uiNewButton("Second");
 	uiButtonOnClicked(b, selectSecond, NULL);
 	uiBoxAppend(hbox, uiControl(b), 0);
diff --git a/ui.h b/ui.h
index 40aea949..c9c225cb 100644
--- a/ui.h
+++ b/ui.h
@@ -226,6 +226,9 @@ _UI_EXTERN uiSeparator *uiNewVerticalSeparator(void);
 typedef struct uiCombobox uiCombobox;
 #define uiCombobox(this) ((uiCombobox *) (this))
 _UI_EXTERN void uiComboboxAppend(uiCombobox *c, const char *text);
+_UI_EXTERN void uiComboboxInsertAt(uiCombobox *c, int n, const char *text);
+_UI_EXTERN void uiComboboxDelete(uiCombobox *c, int n);
+_UI_EXTERN void uiComboboxClear(uiCombobox *c);
 _UI_EXTERN int uiComboboxSelected(uiCombobox *c);
 _UI_EXTERN void uiComboboxSetSelected(uiCombobox *c, int n);
 _UI_EXTERN void uiComboboxOnSelected(uiCombobox *c, void (*f)(uiCombobox *c, void *data), void *data);
diff --git a/unix/combobox.c b/unix/combobox.c
index 6fed804b..5dfeb6f1 100644
--- a/unix/combobox.c
+++ b/unix/combobox.c
@@ -30,6 +30,21 @@ void uiComboboxAppend(uiCombobox *c, const char *text)
 	gtk_combo_box_text_append(c->comboboxText, NULL, text);
 }
 
+void uiComboboxInsertAt(uiCombobox *c, int n, const char *text)
+{
+	gtk_combo_box_text_insert(c->comboboxText, n, NULL, text);
+}
+
+void uiComboboxDelete(uiCombobox *c, int n)
+{
+	gtk_combo_box_text_remove(c->comboboxText, n);
+}
+
+void uiComboboxClear(uiCombobox *c)
+{
+	gtk_combo_box_text_remove_all(c->comboboxText);
+}
+
 int uiComboboxSelected(uiCombobox *c)
 {
 	return gtk_combo_box_get_active(c->combobox);
diff --git a/windows/combobox.cpp b/windows/combobox.cpp
index 50f49dd7..bee0e1c2 100644
--- a/windows/combobox.cpp
+++ b/windows/combobox.cpp
@@ -69,6 +69,38 @@ void uiComboboxAppend(uiCombobox *c, const char *text)
 	uiprivFree(wtext);
 }
 
+void uiComboboxInsertAt(uiCombobox *c, int n, const char *text)
+{
+	WCHAR *wtext;
+	LRESULT res;
+
+	wtext = toUTF16(text);
+	res = SendMessageW(c->hwnd, CB_INSERTSTRING, (WPARAM)n, (LPARAM) wtext);
+	if (res == (LRESULT) CB_ERR)
+		logLastError(L"error inserting item to uiCombobox");
+	else if (res == (LRESULT) CB_ERRSPACE)
+		logLastError(L"memory exhausted inserting item to uiCombobox");
+	uiprivFree(wtext);
+}
+
+void uiComboboxDelete(uiCombobox *c, int n)
+{
+	LRESULT res;
+
+	res = SendMessage(c->hwnd, CB_DELETESTRING, (WPARAM)n, 0);
+	if (res == (LRESULT) CB_ERR)
+		logLastError(L"error removing item from uiCombobox");
+}
+
+void uiComboboxClear(uiCombobox *c)
+{
+	LRESULT res;
+
+	res = SendMessage(c->hwnd, CB_RESETCONTENT, 0, 0);
+	if (res == (LRESULT) CB_ERR)
+		logLastError(L"error clearing items from uiCombobox");
+}
+
 int uiComboboxSelected(uiCombobox *c)
 {
 	LRESULT n;