Environment
Provide version numbers for the following components (information can be retrieved by running tns info in your project folder or by inspecting the package.json of the project):

• CLI: 6.0.0
• Cross-platform modules: 6.0.2
• Android Runtime: 6.0.0
• iOS Runtime: 6.0.0
• Plugin(s):

Describe the bug
This is a rather strange bug. If you have a TextField on the 2+ tab, AND you have the TextField.edtable property bound to some value AND the autocapitalizationType is set to sentences (the default one), the text field never gets enabled.

To Reproduce
https://play.nativescript.org/?template=play-tsc&id=mim6bV
Go on the second tab and try to focus the field.

Expected behavior
TextField is focusable.

Workaround
Change autocapitalizationType to something else or remove the editable property binding.

Related to #6967