X++ code for Multiple Field Lookup to get all fields of a query in ax 2012

First create a table
Create a query with above table
Create  a Form using above Query as DataSource

Create a new String Edit field in Design and name it as Lookup ,its property should be auto declaration yes

public void init()

{

    SysLookupMultiSelectCtrl sysLookupMultiSelect;

    super();

    sysLookupMultiSelect = SysLookupMultiSelectCtrl::construct(element,Lookup,queryStr(parenchild));

}

Note: here parenchild is query name