This assumes you created a CPButtonBar

setupButtonBar.j

var buttonBar = [[CPButtonBar alloc] initWithFrame:CGRectMake(0,0,100,32)]; //you need to use your own frame obviously      

[someSuperView addSubview:buttonBar];

var addButton = [CPButtonBar plusButton];
[addButton setAction:@selector(add:)];
[addButton setTarget:self];
[addButton setEnabled:YES];

var minusButton = [CPButtonBar minusButton];
[minusButton setAction:@selector(remove:)];
[minusButton setTarget:self];
[minusButton setEnabled:YES];
	
[buttonBar setButtons:[addButton, minusButton]];
[buttonBar setHasResizeControl:NO];