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From what I can tell it's not possible to change the disabled colour of the outline currently.
Also, I think it would make sense to be able to customize hint colour, placeholder colour and ComboBox dropdown icon colour based on the enabled state for example.
I believe implementing this via visual state groups would make sense. At this moment in time I only see visual states for "Normal", "Focused" and "Error".
Adding a "Disabled" state group would allow the end user to add customization for this state.
I have tried adding a disabled state group and overriding the control to tell the visual state manager to go to it manually however the state only sticks if I loop it due to conflicting logic with the controls internal code.