Can select date through datefield even when component is disabled

I have datefield component and its disabled by property setEnabled(false). When I click on the datefield component popup doesnt open.But when I pressed "
DOWN ARROW
" key, datefield popup opens and I can select the date. I should not able to select date with DOWN ARROW key also. Following is the sample code


VerticalLayout layout= new VerticalLayout();
layout.setMargin(true);
setContent(layout);
DateField date= new DateField();
date.setEnabled(false);
layout.addComponent(date);

Please suggest me the solution, so that I could not able to select the date through DOWN ARROW key

It seems to be a bug.
Please file a ticket at https://vaadin.com/bug

I have created the ticket at http://dev.vaadin.com/ticket/13508