Index: board.c
===================================================================
--- board.c	(revision 34157)
+++ board.c	(working copy)
@@ -61,6 +61,7 @@
 	free(pcb->PrintFilename);
 	pcb_ratspatch_destroy(pcb);
 	pcb_data_free(pcb->Data);
+	pcb_data_free(pcb->uilayer_data);
 
 	/* release font symbols */
 	pcb_fontkit_free(&pcb->fontkit);
@@ -84,6 +85,7 @@
 	/* allocate memory, switch all layers on and copy resources */
 	ptr = calloc(1, sizeof(pcb_board_t));
 	ptr->Data = pcb_buffer_new(ptr);
+	ptr->uilayer_data = pcb_buffer_new(ptr);
 
 	for(i = 0; i < PCB_NUM_NETLISTS; i++)
 		pcb_netlist_init(&(ptr->netlist[i]));
Index: board.h
===================================================================
--- board.h	(revision 34157)
+++ board.h	(working copy)
@@ -98,6 +98,8 @@
 	int line_mod_merge_inhibit;
 	struct vtp0_s *line_mod_merge;
 
+	pcb_data_t *uilayer_data;                       /* parent of all UI layers */
+
 	/* random */
 	unsigned suppress_warn_missing_font:1;          /* do not warn for missing font; useful for alien formats not having embedded font */
 };