Currently, the ability to create a Binding on a ChangePropertyAction's Trigger 'Value' Property cannot be bound.
This appears to have broken sometime between 0.1.243 (Functional) and 0.1.251 (Non-Functional).
This appears to be an issue where the Binding is actually created when pressing the 'Create Binding' action, but its not reflected in the Studio UI itself.
Repro Steps:
1) Open the Squad Sample from the GitHub Internal Repo.
2) Navigate to the Interactivity Panels and to the Triggers Tab
3) Select any Element on the Stage
4) Press the '+' in the Triggers Tab to create a new Trigger, and select an 'Even Trigger' from the DropDown list.
5) In the Trigger's Properties set the following:
Source=<Self>
Event='Click'
6) Add an Action to this Trigger of Type 'ChangePropertyAction', then set the following:
Target: 'Squad_ListBox'
Property Name: 'SelectedIndex'
7) Hover over the 'Value' field, click on its 3-Dot menu, and select 'Create Binding'.
Observe how no action is completed, and the Binding module that allows its configuration does not appear.
Expected Results: Bindings can be created from a ChangePropertyAction's 'Value' Property. | 
