function(xtype) {
        var me = this;

        if (Ext.isArray(xtype)) {
            Ext.Array.forEach(xtype, me.addXTypeToWhitelist, me);
            return;
        }

        if (!Ext.Array.contains(me.whitelist, xtype)) {
            me.whitelist.push(xtype);
        }
    }
function(xtype) {
        var me = this;

        if (Ext.isArray(xtype)) {
            Ext.Array.forEach(xtype, me.addXTypeToWhitelist, me);
            return;
        }

        if (!Ext.Array.contains(me.whitelist, xtype)) {
            me.whitelist.push(xtype);
        }
    }
function ( xtype ) { var me = this ; if ( Ext . isArray ( xtype ) ) { Ext . Array . forEach ( xtype , me . addXTypeToWhitelist , me ) ; return ; } if ( ! Ext . Array . contains ( me . whitelist , xtype ) ) { me . whitelist . push ( xtype ) ; } }
Adds the specified xtype to the {@link #whitelist}.
@param {String/String[]} xtype Adds the xtype(s) to the {@link #whitelist}.
Adds the specified xtype to the {