B : // _setup

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setup()
Declare and define a local constant:

int BTN_W = 108-1;

Define four variables:

btn01_x1 = 0;     btn01_y1 = 0;
btn01_w  = BTN_W; btn01_h  = 25;

Create btn01 as a new Rect Button:

btn01 = new RectButton(btn01_x1, btn01_y1,
                       btn01_w, btn01_h,
                       0, "File");