[SOLVED] MIDI drums layering

If I record say, 4 bars of MIDI drums then stop the recording . When I start the recording again on the same track to add more drums they appear on another layer within the same track, making it impossible to edit the first layer.
Is there a way to stop this or choose the hidden layer for editing?

Ok I found it, you select the track using the select button and the use the glue button.