Has nobody an idea? Is the description not clear?
It is currently not possible to influence the current view, selection from outside the widget. (But, if somebody wants to make a fork of the widget to add this functionality, we will open-source the widget on GitHub)
In your specific situation however, is your navigation structure flat or hierarchical? Since, if I understand it correctly, you are able to further drill down your selection in your main view. Note that the treeview can show hierarchical structures; if this is used to make the selection you might avoid the whole situation. Or if your top level structure is flat, you could also use the GridView widget, which is very similar, but does support altering the current selection from a microflow.
Some ideas how I can realize that?
Did someone work with the "Selection References" attribute of the tree view widget in Mendix 5.6.2? For me it seems not to be working anymore.