Hello,

In order to display multiple columns in WebDropDown, the current approach is to use a WebDataGrid as an item template:
http://help.infragistics.com/doc/ASPNET/2014.1/CLR4.0/?page=WebDropDown_Create_a_Multi_Column_WebDropDown_using_Templates.html
The AIKIDO WebDropDown does not currently instantiate a grid by default, inside its item template to allow multiple columns to be used (the old WebCombo instantiated an UltraWebGrid at all times).
A live sample illustrating a WebDataGrid template in WebDropDown can be seen at:
http://es.infragistics.com/samples/aspnet/drop-down/templates 

It is possible to compare the APIs for the classic and the Aikido based controls and observe the differences. 

As there is no UltraGrid object in the WebDropDown, all properties referring to it will be non-existing. I suggest to get familiar with the WebDropDown and the WebDataGrid styling and functionality.
http://es.infragistics.com/community/blogs/craig_shoemaker/archive/2011/07/11/introducing-the-webdatagrid-webhierarchicaldatagrid-cheat-sheet.aspx
http://es.infragistics.com/help/aspnet/webdatagrid_cheat_sheet.html 

There are many topics in the forum regarding the styling. The styling of the Aikido controls is done basically trough the CSS files. You can take a look at the CSS file for some StyleSet (theme), to get an idea of the used CSS class names for the WebDropDown:http://es.infragistics.com/samples/aspnet/drop-down/themes

Useful references:
CSS File Structure
Which are my CSS files?
WebDataGrid CSS styling guide 

These are the main css classes that you will probably need to change, to modify the styling:
igdd_Control => class applied to the main control's DIV element
igdd_ControlArea => class applied to the table holding the dropdown input and the dropdown button
igdd_ ControlHover => class applied automatically when the DropDown is hovered with the mouse (Control is meant to be the input and the dropdown button , i.e. everything without the dropdown container )
igdd_LoadingItemsMessage => class applied to the SPAN element that displays a loading message (for paging, filtering, load on demand features, etc)igdd_ControlFocus => CSS class applied when the control gains focus
igdd_ValueDisplay => CSS class applied to the input element where one enters text 
igdd_DropDownList => CSS class applied to the UL HTML element that holds the dropdown items 
igdd_DropDownListContainer => css class applied to a DIV that holds the dropdown list 
igdd_DropDownButton => CSS class applied to the dropdown button image placeholder
igdd_ListItem => applied to an individual dropdown item (<LI> html element)
igdd_ListItemActive, igdd_ListItemSelected, igdd_ListItemHover, igdd_ListItemDisabled => CSS classes applied to items depending on their state (when it becomes Active, selected, disabled, etc.)
igdd_Pager => class applied to the pager , when paging is enabled
igdd_PageLink => class applied to each page link 
igdd_PageCurrent => class applied to the current page  

Also most of these can be set in the ASPX markup itself, for example to style an item :
    <ig:DropDownItem ActiveCssClass="activeClass" CssClass="normalClass" DisabledCssClass="disabledClass"  HoverCssClass="hoveredClass" SelectedCssClass="selectedClass" Text="item text"></ig:DropDownItem>

You can also set these programmatically.

Also, if you do not want to directly manipulate the CSS classes, you can use the Infragistics AppStylist application, which will easily allow you to style the WebDropDown in a design-time surface.

About AppStylist:
http://help.infragistics.com/Help/Doc/ASPNET/2014.1/CLR4.0/HTML/Web_Enabling_Application_Styling_Using_the_AppStylingManager.htmlEnabling Application Styling Using the web.config File

http://help.infragistics.com/doc/ASPNET/2014.1/CLR4.0/?page=WebDropDown_Create_a_Multi_Column_WebDropDown_using_Templates.html 

specifies addition of grid , i just want to add column of grid will the same code work for it.

You can set the TextField and ValueField properties to map to different columns of the data source object.

I hope this helps. Please let me know if I misunderstood you or if you have any further questions regarding this issue.