ContextMenuStrip

I have created a Settings file for my project to define strings something
like:
"Save" - SaveMenuCaption
"Exit" - ExitMenuCaption

Now I dropped a ContectMenuStrip onto my form.
Then define 2 items for it.
I set the property (ApplicationSettings)|(PropertyBindings), the text
property to select from the drop down menu,
chose SaveMenuCaption.

So I assume the text property of this menu item should be "Save". However,
it showed "SaveMenuCaption".

I worked for other buttons, labels but not this ones.