Index: trunk/src/extobj.h
===================================================================
--- trunk/src/extobj.h	(revision 28908)
+++ trunk/src/extobj.h	(revision 28909)
@@ -61,6 +61,7 @@
 	void (*chg_attr)(pcb_subc_t *subc, const char *key, const char *value); /* called after an attribute changed; value == NULL means attribute is deleted */
 	void (*del_pre)(pcb_subc_t *subc); /* called before the extobj subcircuit is deleted - should free any internal cache, but shouldn't delete the subcircuit */
 	pcb_subc_t *(*conv_objs)(pcb_data_t *dst, vtp0_t *objs, pcb_subc_t *copy_from); /* called to convert objects into an extobj subc; returns NULL on error; objects should not be changed; if copy_from is not NULL, the new extobj is being created by copying copy_from (the implementation should pick up info from there, not from PCB) */
+	void (*gui_propedit)(pcb_subc_t *subc); /* invoke implementation-defined GUI for editing extended object properties */
 
 	/* dynamic data - filled in by core */
 	int idx;
Index: trunk/src/extobj_act.c
===================================================================
--- trunk/src/extobj_act.c	(revision 28908)
+++ trunk/src/extobj_act.c	(revision 28909)
@@ -150,8 +150,74 @@
 	return 0;
 }
 
+
+static const char pcb_acts_ExtobjGUIPropEdit[] = "ExtobjGUIPropEdit([object, [idpath]])";
+static const char pcb_acth_ExtobjGUIPropEdit[] = "Invoke the extobj-implementation-specific GUI property editor, if available";
+fgw_error_t pcb_act_ExtobjGUIPropEdit(fgw_arg_t *res, int argc, fgw_arg_t *argv)
+{
+	pcb_board_t *pcb = PCB_ACT_BOARD;
+	pcb_extobj_t *eo;
+	int op = F_Object;
+	pcb_subc_t *obj;
+
+	PCB_ACT_MAY_CONVARG(1, FGW_KEYWORD, ExtobjGUIPropEdit, op = fgw_keyword(&argv[1]));
+
+	switch(op) {
+		case F_Object:
+			if (argc > 2) { /* convert by idpath */
+				pcb_idpath_t *idp;
+				PCB_ACT_CONVARG(2, FGW_IDPATH, ExtobjGUIPropEdit, idp = fgw_idpath(&argv[2]));
+				if ((idp == NULL) || !fgw_ptr_in_domain(&pcb_fgw, &argv[2], PCB_PTR_DOMAIN_IDPATH))
+					return FGW_ERR_PTR_DOMAIN;
+				obj = pcb_idpath2obj(PCB, idp);
+			}
+			else { /* interactive convert */
+				void *p1, *p3;
+				pcb_coord_t x, y;
+				pcb_hid_get_coords("Click on extended object to edit", &x, &y, 0);
+				obj = NULL;
+				if (pcb_search_screen(x, y, PCB_OBJ_SUBC, &p1, &obj, &p3) == 0) {
+					pcb_message(PCB_MSG_ERROR, "ExtobjConvFrom: object not found (no object under the cursor)\n");
+					PCB_ACT_IRES(-1);
+					return 0;
+				}
+			}
+			if ((obj == NULL) || ((obj->type & PCB_OBJ_CLASS_REAL) == 0)) {
+				pcb_message(PCB_MSG_ERROR, "ExtobjConvFrom: object not found\n");
+				PCB_ACT_IRES(-1);
+				return 0;
+			}
+			break;
+
+		default:
+			PCB_ACT_FAIL(ExtobjConvFrom);
+	}
+
+	if ((obj == NULL) || (obj->type != PCB_OBJ_SUBC) || (obj->extobj == NULL)) {
+		pcb_message(PCB_MSG_ERROR, "Object is not an extended object");
+		PCB_ACT_IRES(1);
+		return 0;
+	}
+
+	eo = pcb_extobj_get(obj);
+	if (eo == NULL) {
+		pcb_message(PCB_MSG_ERROR, "Extended object '%s' is not available", obj->extobj);
+		PCB_ACT_IRES(1);
+		return 0;
+	}
+
+	if (eo->gui_propedit != NULL)
+		eo->gui_propedit(obj);
+	else
+		pcb_message(PCB_MSG_ERROR, "Extended object '%s' does not implement GUI property editor", obj->extobj);
+
+	PCB_ACT_IRES(0);
+	return 0;
+}
+
 pcb_action_t pcb_extobj_action_list[] = {
-	{"ExtobjConvFrom", pcb_act_ExtobjConvFrom, pcb_acth_ExtobjConvFrom, pcb_acts_ExtobjConvFrom}
+	{"ExtobjConvFrom", pcb_act_ExtobjConvFrom, pcb_acth_ExtobjConvFrom, pcb_acts_ExtobjConvFrom},
+	{"ExtobjGUIPropEdit", pcb_act_ExtobjGUIPropEdit, pcb_acth_ExtobjGUIPropEdit, pcb_acts_ExtobjGUIPropEdit}
 };
 
 PCB_REGISTER_ACTIONS_FUNC(pcb_extobj_action_list, NULL)
Index: trunk/src/pcb-menu-default.lht
===================================================================
--- trunk/src/pcb-menu-default.lht	(revision 28908)
+++ trunk/src/pcb-menu-default.lht	(revision 28909)
@@ -742,7 +742,8 @@
 
 		ha:popup-obj-extobj-subcircuit {
 			li:submenu {
-				ha:Edit extobj properties             { action=propedit(subc) }
+				ha:Edit extobj properties (generic)   { action=propedit(subc) }
+				ha:Edit extobj properties (specific)  { action=ExtobjGUIPropEdit(object) }
 				ha:Edit extobj layer bindings...      { action=LayerBinding() }
 				ha:Edit extobjpadstack prototypes...  { action=pstklib(object) }
 			}
Index: trunk/src_plugins/exto_std/dimension.c
===================================================================
--- trunk/src_plugins/exto_std/dimension.c	(revision 28908)
+++ trunk/src_plugins/exto_std/dimension.c	(revision 28909)
@@ -389,6 +389,12 @@
 
 }
 
+static void pcb_dimension_gui_propedit(pcb_subc_t *subc)
+{
+	pcb_trace("dim: gui propedit\n");
+
+}
+
 static pcb_extobj_t pcb_dimension = {
 	"dimension",
 	pcb_dimension_draw_mark,
@@ -398,5 +404,6 @@
 	pcb_dimension_float_del,
 	pcb_dimension_chg_attr,
 	pcb_dimension_del_pre,
-	pcb_dimension_conv_objs
+	pcb_dimension_conv_objs,
+	pcb_dimension_gui_propedit
 };
Index: trunk/src_plugins/exto_std/line_of_vias.c
===================================================================
--- trunk/src_plugins/exto_std/line_of_vias.c	(revision 28908)
+++ trunk/src_plugins/exto_std/line_of_vias.c	(revision 28909)
@@ -282,6 +282,11 @@
 	return subc;
 }
 
+static void pcb_line_of_vias_gui_propedit(pcb_subc_t *subc)
+{
+	pcb_trace("LoV: gui propedit\n");
+}
+
 static pcb_extobj_t pcb_line_of_vias = {
 	"line-of-vias",
 	pcb_line_of_vias_draw_mark,
@@ -291,5 +296,6 @@
 	pcb_line_of_vias_float_del,
 	pcb_line_of_vias_chg_attr,
 	pcb_line_of_vias_del_pre,
-	pcb_line_of_vias_conv_objs
+	pcb_line_of_vias_conv_objs,
+	pcb_line_of_vias_gui_propedit
 };