[REVIEW REQUEST] Add text property to ComboBox

[Jonathan Giles]

>
> But that aside, you really are assuming having the editor to be a text 
> component of some sort. For entering color I may, for example have a 
> container with three text fields (RGB). Can I not do so?

If you had a color input combo box which had three fields, it should be 
an extension of the ComboBoxBase class, which does not contain the text 
property (it is a property of the ComboBox subclass). This means you can 
expose whatever is relevant for you, which might be redText, blueText 
and greenText string properties, for example, and you would not be 
burdened with the text property in ComboBox.

-- Jonathan