diff --git a/source/main.adb b/source/main.adb
index 6696947..b7c1784 100644
--- a/source/main.adb
+++ b/source/main.adb
@@ -163,6 +163,8 @@ begin
 		--
 		menu_render;
 		--
+		ui.draw_fill_bar (400, 400, 400, 0.6);
+		--
 		ui.synchronize;
 		--
 		ui.draw_help_box (0, core.window_height - text_box_height, core.window_width, text_box_height);
diff --git a/source/ui.adb b/source/ui.adb
index 8853d12..093e116 100644
--- a/source/ui.adb
+++ b/source/ui.adb
@@ -43,10 +43,12 @@ package body ui is
 
                                              ------------------------------------------------------------------------------------------
 
+	structure_limit : constant natural := 12;
+
 	sprite : array (style, element) of core.sprite;
 	font   : array (style)          of core.font;
 
-	structure_array : array (0 .. 12) of structure;
+	structure_array : array (0 .. structure_limit) of structure;
 
 	structure_count : natural := 0;
 
@@ -180,7 +182,7 @@ package body ui is
 
 	procedure synchronize is
 	begin
-		for index in 0 .. 12 loop
+		for index in 0 .. structure_limit loop
 			exit when index = structure_count;
 			--
 			if core.signal_mode = core.signal_code'pos (structure_array (index).toggle) then
@@ -323,6 +325,21 @@ package body ui is
 
                                              ------------------------------------------------------------------------------------------
 
+	procedure draw_fill_bar (x, y, width : in integer; fill : in float) is
+		middle_width : constant integer := width - sprite (active, fill_bar_left).width - sprite (active, fill_bar_right).width;
+		fill_width   : constant integer := integer (float (middle_width) * fill);
+	begin
+		draw (fill_bar_left,  x,                                                       y - sprite (active, fill_bar_left).height);
+		draw (fill_bar_right, x + middle_width + sprite (active, fill_bar_left).width, y - sprite (active, fill_bar_right).height);
+		--
+		draw_horizontally (fill_bar_horizontal, x + sprite (active, fill_bar_left).width, y - sprite (active, fill_bar_horizontal).height, middle_width);
+		draw_horizontally (fill_horizontal,     x + sprite (active, fill_bar_left).width, y - sprite (active, fill_bar_horizontal).height, fill_width);
+		--
+		select_text_box ("", x, y, width, sprite (active, fill_bar_horizontal).height);
+	end draw_fill_bar;
+
+                                             ------------------------------------------------------------------------------------------
+
 	procedure draw_scroll_bar (x, y, height : in integer; offset : in integer) is
 		middle_height : constant integer := height - sprite (active, scroll_bar_upper).height - sprite (active, scroll_bar_lower).height;
 	begin
@@ -408,7 +425,7 @@ package body ui is
 
                                              ------------------------------------------------------------------------------------------
 
-	procedure draw_state_box (x, y : in integer) is
+	procedure draw_state_box (x, y : in integer) is -- TODO: Delete this at some point.
 	begin
 		ui.write ("Cursor X:"       & core.cursor.x'image,       x, y +   0);
 		ui.write ("Cursor Y:"       & core.cursor.y'image,       x, y +  32);
@@ -423,7 +440,7 @@ package body ui is
 
                                              ------------------------------------------------------------------------------------------
 
-	procedure add_structure (data : in structure) is
+	procedure add_structure (data : in structure) is -- TODO: This is dumb, tho less error-prone...
 	begin
 		structure_array (structure_count) := data;
 		--
diff --git a/source/ui.ads b/source/ui.ads
index 54c8b6d..4b2d4fc 100644
--- a/source/ui.ads
+++ b/source/ui.ads
@@ -58,6 +58,7 @@ package ui is
 	procedure draw_frame (description : in string; x, y, width, height : in integer; action : core.pointer := core.idle'access);
 
 	procedure draw_title_bar  (x, y, width  : in integer; title  : in string);
+	procedure draw_fill_bar   (x, y, width  : in integer; fill   : in float);
 	procedure draw_scroll_bar (x, y, height : in integer; offset : in integer);
 
 	procedure draw_menu      (x, y, width, height : in integer);
diff --git a/sprite/ui/dwarf/fill_bar_left.png b/sprite/ui/dwarf/fill_bar_left.png
index 5d8f265..8723288 100644
Binary files a/sprite/ui/dwarf/fill_bar_left.png and b/sprite/ui/dwarf/fill_bar_left.png differ