>How can I define property as an array in a class?
>thank you

Add property with a dimension. ie:
To add a new property named myProperty you'd enter just myProperty
To add a new property named aMyArrayProperty which is an array you'd enter :
aMyArrayProperty[1]

In code :
oObj.Addproperty('aMyArray[1]',.f.)

PS:Initial dimension and value is up to you. You could change that anytime.
Cetin