turn off default new layer

Hi,

When I select certain brushes, it automatically creates a new layer (I understand this is normal). However, because I am trying to work with brushes from various genres, I would prefer that a new layer would not be made, so that every brush automatically works on the layer. Is there a way to set to default that a new layer will not be created when I select (for example) a "thick paint" brush? Thanks, Mike