This is the way to go on with the checkbox:
1) Go to File >> Manage >> Value Lists... >> New >> Value list name: "flag" Use custom values: 1
( you don't need more values than 1 )
2) Go to File >> Manage >> Database... and add a new number field named: flag
3) while in Layout Mode put the new field where you want and format it as a checkbox using the value list : "flag"
4) Whatching the object info, set the dimensions of the field flag to something like 17x17 px.
Now, when in Browse Mode, you'll have finally your check box.