Enable by default to click through transparent areas
Elements and especially screen parts are often positioned one on top of the other. Many times, the canvas area of the screen part is large and overlaps other parts of the prototype. It happens a lot when the screen part has an animation effect (a panel appears upon hovering over a specific area of the screen part, e.g., a menu dropdown). It will be great to allow clicking through a screen part when no objects are placed on it, or when they are invisible/transparent.
I may be misunderstanding the scenario. Correct me if that is the case.
There are two ways to adjust visibility of a UI element. One is by manipulating the transparency slider. But this approach does not remove the UI element.
The other way is to use the explicit hide option. Which is the “eye” in the property panel. You can also right click on top of a UI element and access hide/unhide from the context menu.
What I have suggested is that when a screen part is empty (either really empty of with items set to transparent) item underneath it will be accessible (i.e., clickable).
See for example: http://indigodesigned.com/share/phn8bbtbuxpz
While in most cases you can work around the it, the seamless solution would be (IMHO) the above suggestion.
If I understood the attached image correctly, you have a screenpart that's been placed on top of the current view, and you have set the transparency to 100% so that it's not visible. I take it when pressing #1, the screenpart which was not visible earlier is now shown, and in the process covers #2.
Have you already tried hiding it instead instead of using the transparency slider?
PROPERTIES ----> HIDE | LOCK
Hide is represented by the "eye" icon.
To show it again, you can right click in the same area, and find it in the list of "elements under the cursor" to toggle the visibility again.
If I have misunderstood, can you shoot an email to firstname.lastname@example.org so that we can take a deeper dive?