Open combo list only pressing on button at the right side

Tell me please, how to make combobox list opens only if I pressed button (with down arrow at the right) and disable opening during typing text or focusing the input field?

Thanks a lot!

There is no way to change behavior of select box in described way by using existing API.
It possible to modify source code - so combo will work in desired way. Please check attached version ( please beware that it is a custom build, not officially supported version ) (8.54 KB)

It works perfectly!

Thanks a lot for such a fast reaction!

P.S. So far guys you are the best support I’ve ever dealt with!