In the Windows.onResize() example documentation ([Login to see the link]), "win:onResize()" is explicitly called to display the status bar for the first time. This call is not necessary, since it seems that the onRise() event is executed the first time the window is shown. I have run the example without "win:onResize()" (line 13) and the status bar is displayed immediately.
If this is not a bug, you should change the example in the documentation.
I have LuaRT 1.4.0 x64 installed.