add show_checkbox_dialog

samples/radio-dialog.sample.lua

@@ -0,0 +1,16 @@
+function on_resume()
+    ui:show_text("Open dialog")
+end
+
+function on_click()
+    dialog_items = { "One", "Two", "Three" }
+    ui:show_radio_dialog("Title", dialog_items, 2)
+end
+
+function on_dialog_action(idx)
+    if idx == -1 then
+        ui:show_toast("Dialog cancelled")
+    else
+        ui:show_toast("Choosen: "..dialog_items[idx])
+    end
+end