Create And Initialize An Array Of Structures Of A Fixed Size?

I am trying to create and initialize an array of structures of a fixed size. Each struct will be populated when a button is clicked. Here is an example of my struct:

public structure buttonStruct
dim x() as Boolean
dim y() as Boolean

[code]....

In my form_load function I am declaring the array of structs and:

Dim BtnStruct(15) As ButtonStruct
BtnStruct(0).Initialize()

[code]....

Whenever a specific button is clicked, I am trying to collect data and store it in the respective struct and so for example, if button 1 is clicked then I will store the data associated with button 1 into BtnStruct(0). The position of the button is stored in a public variable called BtnNum. If I attempt to store information in the struct inside another function as follows, I receive an error

BtnStruct(BtnNum).x(pos - 1) = temp "btnstruct is not declared. it may not be inaccessible due to its protection level"