Error when the user clicks again on MenuCommand of type flyout

[smilealdway]

winjs/src/js/WinJS/Controls/Menu/_Command.js

Line 485 in 62d6521

if (subFlyout && subFlyout.hidden && subFlyout.show) {

winjs/src/js/WinJS/Controls/Menu/_Command.js

Line 507 in 62d6521

e();

I built a MenuCommand of type flyout and assigned WinJS.UI.Flyout to the "flyout" property of the MenuCommand object.

Steps to reproduce the error -

1. Hover over the MenuCommand to open the flyout
2. Click on the MenuCommand

On step 2, the error handler on line 507 is invoked because the subFlyout.hidden property is false.

Is this an expected behavior?