ANTLR Operator Precedence

How is operator precedence implemented in ANTLR?

I'm using the XText/Antlr package at the moment.

Edit:

I did what sepp2k suggested, and operator precedence works now, but stuff like 3 +* also work now. The operators are basically "falling through" the tree.

Also, I tried the C grammar on ANTLR's website and the same thing happened in ANTLRworks.

Anyone know what the issue is?

BinaryExpression:
  'or'? AndOp; //or op

AndOp:
  'and'? ComparisonOp;

ComparisonOp:
  ('>'|'<'|'>='|'<='|'=='|'~=')? ConcatOp;

ConcatOp:
  '..'? AddSubOp;

AddSubOp:
  ('+' | '-')? MultDivOp;

MultDivOp:
  ('*' | '/')? ExpOp;

ExpOp:
  '^'? expr=Expression;