Does not show drop-down on tab event

[dragonwasrobot]

Hi

I think I may have found a small bug: if I have an input form and I tab through the input fields, then when I get to the elm-select-two field it does not pop out the drop-down of options nor does its auto-complete kick in if I start typing something.It works fine when I click on the elm-select-two input field with the mouse cursor.

When debugging I can see the two events SelectTwoTrigger -> SelectTwoOpen when clicking on the input field with the cursor but I just get a STNull event when I tab my way to the input field.

Hope that makes sense and thx for the nice package 👍