I have an app I built where I have a Gallery that includes data type where a radio button is used to display it. If I set the DisplayMode to Edit, the tooltips on the radio button work as expected. If I set it to View, the tooltips don't work. This is not an issue with radio buttons in View mode on Forms, only when they are included in a view-only Gallery control. I'm sure I "could" hack this with a label instead, but figured I'd report a bug before I resort to reworking this.
Attaching screenshots. "ACT" is short for "Active". I use "ACT" as the "true" property of the radio buton to save screen real estate.