title: Force tkinter listbox to highlight item when selected before task is started
body: <p>I have a tkinter listbox, when I select a item it performs a few actions then returns the results, while that is happening the item I selected does not show as selected, is there a way to force it to show selected immediately so it's obvious to the user they selected the correct one while waiting on the returned results? I'm using python 3.4 and I'm on a windows 7 machine. </p>