Index: source/blender/editors/interface/interface.c
===================================================================
--- source/blender/editors/interface/interface.c	(revision 37036)
+++ source/blender/editors/interface/interface.c	(working copy)
@@ -1670,15 +1670,12 @@
 
 void ui_set_but_default(bContext *C, uiBut *but, short all)
 {
-	/* if there is a valid property that is editable... */
-	if (but->rnapoin.data && but->rnaprop && RNA_property_editable(&but->rnapoin, but->rnaprop)) {
-		int index = (all)? -1 : but->rnaindex;
-		
-		if(RNA_property_reset(&but->rnapoin, but->rnaprop, index)) {
-			/* perform updates required for this property */
-			RNA_property_update(C, &but->rnapoin, but->rnaprop);
-		}
-	}
+	PointerRNA ptr;
+
+	WM_operator_properties_create(&ptr, "UI_OT_reset_default_button");
+	RNA_boolean_set(&ptr, "all", all);
+	WM_operator_name_call(C, "UI_OT_reset_default_button", WM_OP_EXEC_DEFAULT, &ptr);
+	WM_operator_properties_free(&ptr);
 }
 
 static double soft_range_round_up(double value, double max)
Index: source/blender/editors/interface/interface_handlers.c
===================================================================
--- source/blender/editors/interface/interface_handlers.c	(revision 37036)
+++ source/blender/editors/interface/interface_handlers.c	(working copy)
@@ -4442,10 +4442,10 @@
 		}
 		/* reset to default */
 		/* XXX hardcoded keymap check.... */
-		else if(ELEM(event->type, ZEROKEY, PAD0) && event->val == KM_PRESS) {
-			/* ctrl-0 = for arrays, only the active one gets done (vs whole array for just 0) */
+		else if(ELEM(event->type, DELKEY, PADPERIOD) && event->val == KM_PRESS) {
+			/* del - reset active button; ctrl+del - reset a whole array*/
 			if (!(ELEM3(but->type, HSVCIRCLE, HSVCUBE, HISTOGRAM)))
-				ui_set_but_default(C, but, !event->ctrl);
+				ui_set_but_default(C, but, event->ctrl);
 		}
 		/* handle menu */
 		else if(event->type == RIGHTMOUSE && event->val == KM_PRESS) {