Currently, we offer a wide range of Behaviors in the Interactivity Panel that can be applied to Elements.

Some of the Behaviors are universal, and can be applied to all Elements. However, some can only be attached to specific Element types.

For example:

LineDecoration Behavior to the TextBlock Element.
CollectionSortBehavior to a Collection Element.
CollectionFilter Behavior to a Collection Element.

In the attached image, in the user interface, it makes it appear as though a LineDecoration Behavior can be applied to a Rectangle Element, when it reality, will produce no effect.

With this in mind, in the 'Add Behavior' dropdown, we have an opportunity to make more clear which Behaviors are eligible to be applied to the selected Element.

Ideally, instead of filtering/collapsing ineligible Elements, they become greyed-out/disabled in the Behaviors listing, and upon hover, for the examples given above, the tooltip would read something along the lines of:

ToolTip: "Only attachable to TextBlock Elements"
ToolTip: "Only attachable to Collection Elements"