Array storing only the latest element with array length 1.

Hi,

I have created an array variable with item type as string.

I have multiple lines with different data. each line can be selected using a check box. Every time I select a line using check box, this array is invoked to store a particular element of my line.

but the problem is whenever I click on multiple check boxes, the array is storing only the latest element with array length as 1.

Can some one please help me understand what I am doing and why my array length is always 1.

Any help is much appreciated.

Thanks