How to show all items on click of autocompleteextender target search textbox?

Question

I am trying to display all the list items on an autocompleteextender in asp.net. I have set the MinimumPrefixLength = 0 as suggested in this question. My problem is that the list doesn't show on first click. Only if I type something and remove it and then click on it, it shows the list. How do achieve it in the first click?

Answer 1

Unfortunately, I couldn't get the desired result after trying a lot. Hence decided to go with jquery select2 plugin for normal dropdowncontrols.