Yet more proposals for the combo_box widget

I'm looking to modify the combo box widget in a couple ways.

1) I'd like to make the widget check to see if there are any other drop 
down lists open on any other registered combo box's. If there is another 
open one, it should close before the option list for the current combo 
box opens up.

This is an issue for me when I have many combo box's located one on top 
of the other and a user tabs down the tabindex and they open up but the 
user doesn't pick anything. It covers up my other combo box's under the 
option list of the open one.

Just in general I think that they should follow the behavior of a 
typical select box.

2) I would like to see the combo box load the first item in the option 
list if there is no default selected value assigned.

3) If the user types a partial string into the input box and tab's off 
of the widget before the option drop down list pop's up, I'd like to see 
the widget match against the first option that matches the string 
fragment that was present in the widget at the time the tab occurred.

I realize that some won't want this to be the default behavior of the 
widget, but I simply want to be able to force this behavior even if it 
means more attributes on the inline ctor.

--Michael


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