Guys, i want to add toolbar with button in Combobox, i use the button to select all record in combobox. In ExtJS 4 it's worked, but in ExtJS 5.0.1 i can't even pressed the button so event is not fired. Combobox always unexpand if i pressed the button. It is bug?

here's the fiddle: http://ift.tt/1wiDSl8