static/ext/src/ux/grid/FilterBar.js
function() {
		var me = this,
			field = undefined;

		Ext.each(me.grid.headerCt.getGridColumns(), function(col) {
			if (col.filter) {
				field = me.fields.get(col.dataIndex);
				return false;
			}
		});

		return field;
	}
function() {
		var me = this,
			field = undefined;

		Ext.each(me.grid.headerCt.getGridColumns(), function(col) {
			if (col.filter) {
				field = me.fields.get(col.dataIndex);
				return false;
			}
		});

		return field;
	}
private