I'm currently making a computer on an application called Smart Logic Simulator. However, it doesn't have any tri-state buffers and therefor I cannot make a bus (based off the DM74LS245 chip). Is there a way to make a tri-state buffer?
EDIT: Note - I don't know much about logic, and it's possible that the thing I want to make isn't a tri-state buffer, but that's what I think it is.
Here are the elements in the app I'm using: