Index: objects/standard/box.c
===================================================================
--- objects/standard/box.c	(revision 3781)
+++ objects/standard/box.c	(working copy)
@@ -140,7 +140,7 @@
   { NULL, 0 }
 };
 static PropDescription box_props[] = {
-  ELEMENT_COMMON_PROPERTIES,
+  ELEMENT_RESIZABLE_COMMON_PROPERTIES,
   PROP_STD_LINE_WIDTH,
   PROP_STD_LINE_COLOUR,
   PROP_STD_FILL_COLOUR,
@@ -357,11 +357,13 @@
   DiaObject *obj = &elem->object;
   real radius;
   
+  elem->height = MAX(elem->height, 0.01);
+  elem->width = MAX(elem->width, 0.01);
+
   if (box->aspect == SQUARE_ASPECT){
     float size = elem->height < elem->width ? elem->height : elem->width;
     elem->height = elem->width = size;
   }
-
   radius = box->corner_radius;
   radius = MIN(radius, elem->width/2);
   radius = MIN(radius, elem->height/2);
Index: lib/element.h
===================================================================
--- lib/element.h	(revision 3781)
+++ lib/element.h	(working copy)
@@ -74,6 +74,15 @@
   { "elem_height", PROP_TYPE_REAL, PROP_FLAG_DONT_MERGE  | PROP_FLAG_NO_DEFAULTS, \
     "Element height", "The height of the element", &width_range}
 
+#define ELEMENT_RESIZABLE_COMMON_PROPERTIES \
+  OBJECT_COMMON_PROPERTIES, \
+  { "elem_corner", PROP_TYPE_POINT, PROP_FLAG_NO_DEFAULTS, \
+    "Element corner", "The corner of the element"}, \
+  { "elem_width", PROP_TYPE_REAL, PROP_FLAG_DONT_MERGE | PROP_FLAG_NO_DEFAULTS | PROP_FLAG_VISIBLE, \
+    "Element width", "The width of the element", &width_range}, \
+  { "elem_height", PROP_TYPE_REAL, PROP_FLAG_DONT_MERGE  | PROP_FLAG_NO_DEFAULTS | PROP_FLAG_VISIBLE, \
+    "Element height", "The height of the element", &width_range}
+
    /* Would like to have the frame, but need to figure out why
       custom_object ext_attributes lose their updates when they're on
       (see http://mail.gnome.org/archives/dia-list/2005-August/msg00053.html)