>One of the problems with textboxes, comboboxes, editboxes (and some others) is that they don't lose focus when a toolbar button is clicked.

Just another reason why I use dialog buttons instead of toolbars. Another is that on a high resolution screen (especially with a small form), it's a long "reach" over to the toolbar. And if you have more than one form open, using dialog buttons makes it clear what form the action applies to.