All Tools provide a method the last stroke that you model, either one made inside already there. If you do anything other some Tools such as Blur modify pixols already on the you select a different Tool or make another canvas stroke do next.
Press Transp to activate Transperancy between SubTools. This allows you to modify the last stroke that you drew, or edit your model in 3D mode. This transform capability is also useful with paint strokes. Once Transparency is active Ghost mode becomes enabled; this mode displays the inactive SubTools as translucent white and can be turned on.
