add sample with state

buttons_with_state_sample.lua

@@ -0,0 +1,19 @@
+buttons = { "Disabled", "Disabled", "Disabled" }
+
+function onResume()
+    redraw()
+end
+
+function onClick(idx) 
+    if buttons[idx] == "Disabled" then
+        buttons[idx] = "Enabled"
+    else
+        buttons[idx] = "Disabled"
+    end
+
+    redraw()
+end
+
+function redraw()
+    ui:showButtons(buttons)
+end