Object Selection
By default, clicking the part of a resource with a mechanism selects the entire resource. Depending on other constraints, you may click a product or resource and select more than that resource or product.
When you select a part of a resource, such as a mechanism, you select the parent of the mechanism. For example, the robot as a whole is the parent of the mechanism, so selecting a part of the robot selects the whole robot.
If you select a resource for which you have created a
Fix In Space
constraint, you can select only the parent that contains
the object, but not the resource itself.
This rule's purpose is to protect you from moving a resource within its parent context.
Selecting a product or resource highlights the object in the tree.
The selected object is the active object.