Hi Eivind,
Currently, tab completion does not support properties for classes which inherit from RedefinesDot. One reason is because the dot predictions would require running MATLAB code from your class's dotReference method. In most cases, tab completion relies on a properties blocks to know which properties should be shown.
Depending on the logic in your class, you could change your classdef to instead use Dependent Properties. These are declared in a properties block, so tab completion will know about them. This might fit your situation better than RedefinesDot, depending on what else is in your dotAssign, dotReference, and dotListLength implementation. Particularly, if you only wish to override behavior for the LinkedFiles property, this is much more targeted and will let MATLAB handle all other dot operations.
One thing worth mentioning is that both Dependent Properties and RedefinesDot can slow down your object performance if you put too much code inside of the indexing methods (dotAssign, dotReference, get.LinkedFiles, etc.). I recommend keeping overloaded indexing logic as simple as possible, especially if you index into these properties often, such as in loops.
There is one other alternative that doesn't use either. Get/Set Methods. These are very similar to Dependent Properties, but I don't think they fit your solution as well. Unlike Dependent Properties, Get/Set methods require the property to exist within the class. If you access it from within the class file, you bypass Get/Set methods. However, in your case, it sounds like the property doesn't really exist in your MyClass definition. It exists in your LinkedFile definition, and you want to refer to these other properties using custom logic. For that reason, a Dependent Property sounds more appropriate between the two.
