add: this.grid = []; 
context:     clearGrid:function() {        if (this.grid) {            for(var iRow=0; iRow < this.grid.length; iRow++) {                var row = this.grid[iRow];                for(var iCol=0; iCol < row.length; iCol++) {                    OpenLayers.Util.clearArray(row[iCol]);                }            }        }    },
meta: 8310	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/8310/7e9eef8d075fa88068923404fa67c84bba79643e/Grid.js/clean/lib/OpenLayers/Layer/Grid.js