Not really sure if this is even a bug as much as an inconveniency. But if you create a sliderbar or any other system UI element such as buttons etc. And press "tab" until it is selected/highlighted. There are no way to deselect it again unless you press "Tab" once more.
For the buttons you can use unfocus, but something like this doesn't exist for the sliderbar, and not sure there is a good way to deal with it for buttons anyway.
The problem is that keyboard input doesn't work while one of these are selected.
Maybe an option to remove these elements from working with "Tab" or something. Anyway not the biggest problem ever just inconvenient if you use them.
Attach a Capx
Not capx related
Description of Capx
Steps to Reproduce Bug
Create any system UI element and tab during runtime until it is selected. Make something that react to a "key press" and it wont work, while the element is selected.
While selected keyboard input doesn't work.
Operating System and Service Pack
Construct 2 Version ID
r180 but most likely all versions as these are system elements.