Enhanced TreeComboBox

[hbrands]

Hi,
I would like to suggest the following two enhancements to TreeComboBox:

1)
Make Searchable work with TreeComboBox.

2)
provide a filterable TreeComboBox with the following capability:

- the editable textfield of the ComboBox is used to enter a search/filter term

- the tree popup opens and shows only the matching tree nodes, depending on the entered search text

- provide an optional strict mode, so that only search strings are allowed that match at least one tree node, e.g. you can only select avaiable tree nodes, not creating new ones.

So it's similiar to
- the QuickFilter (Tree) Demo
and
- AutoCompletion JComboBox in strict mode Demo
combined in form of a TreeComboBox.

What do you and other users think about it?