让舞台上的按钮btn灰掉

/*让舞台上的btn灰掉*/

var matrix:Array = new Array();

matrix = matrix.concat([.3,.59,.11,0,0]);// red

matrix = matrix.concat([.3,.59,.11,0,0]);// green

matrix = matrix.concat([.3,.59,.11,0,0]);// blue

matrix = matrix.concat([0,0,0,1,0]);// alpha

var filter:ColorMatrixFilter = new ColorMatrixFilter(matrix);

btn.filters = [filter];