PIC's ports individual bits manipulation - how to?

[flotulopex]

I just made this piece of code as test.

MYPORT  var PORTA
Loop    var BYTE
PORTA.0 = MYport.0
PORTA.1 = MYport.1
PORTA.2 = MYport.2
PORTA.3 = MYport.3

PORTA.6 = 1 'Test to check port's state change in simulator...

Start:
    for LOOP = 0 to 3
        myport.0[Loop] = 1  'High
        myport.0[loop] = 0  'Low
    next
    goto start
END

It works except the PORTA.6 will change it's status from 1 to 0 when the firt loop will be executed.