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PIXI Mask with transparency lines


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Hi guys!
I'm trying to create PIXI mask with transparency at the top and at the bottom of rectangle. To make transparency I draw 10 lines with different alpha at the top, then draw a rectangle and 10 lines at  the bottom. But the problem is that mask is created  without transparency. It just makes 10 lines without alpha.  How to achieve a transparency effect without using png sprite? Just PIXI.Graphics. Thank you!

Here is my code:

var mask = new PIXI.Graphics(),
    x = 0,
    y1 = 200,
    y2 = 600,
    width = 1000,
    alpha = 0.1,
    steps = 10,

//first block of 10 lines 
for (i = 0; i < steps; i++) {
    mask.moveTo(0, y1 + i);
    mask.lineStyle(1, "0xffffff", alpha);
    mask.lineTo(width, y1 + i);
    alpha += 0.1;

mask.drawRect(x, y1 + steps, width, 390);
alpha = 1;

//second block of 10 lines 
for (i = 0; i < steps; i++) {
    mask.moveTo(0, y2 + i);
    mask.lineStyle(1, "0xffffff", alpha);
    mask.lineTo(width, y2 + i);
    alpha -= 0.1;


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