* Left-button: replace/add to current selection. * Right-button: remove from current selection. * Left-button: Replace/add to current selection. * Right-button: Remove from current selection. * Left-button: Replace/add to current selection. * Right-button: Remove from current selection. * Left-button: Replace/add to current selection. * Right-button: Remove from current selection. * Left-button: Replace/add to current selection. * Right-button: Remove from current selection. * Left-button: Erase with the background color in `Background' layer or transparent color in any other layer. * Right-button: Replace foreground with background color.