//Java 

import org.apache.wicket.extensions.markup.html.form.select.Select;

import org.apache.wicket.extensions.markup.html.form.select.SelectOption;

//variable to hold the SELECTED VALUE from dropdown box,

//and also make "jQuery" selected by default

private String selected = "jQuery";

Select languages = NEW Select("languages", new PropertyModel<String>(this, "selected"));

form.add(languages);

languages.add(new SelectOption<String>("framework1", new Model<String>("Wicket")));

languages.add(new SelectOption<String>("framework2", new Model<String>("SPRING MVC")));

languages.add(new SelectOption<String>("framework3", new Model<String>("JSF 2.0")));

languages.add(new SelectOption<String>("Script1", new Model<String>("jQuery")));

languages.add(new SelectOption<String>("Script2", new Model<String>("prototype")));

 //HTML for dropdown box

<select wicket:id="languages">

<optgroup label="Frameworks">

<option wicket:id="framework1" >Wicket (1.4.7)</option>

<option wicket:id="framework2" >Spring MVC (3.0)</option>

<option wicket:id="framework3" >JSF (2.0)</option>

</optgroup>

<optgroup label="JAVASCRIPT">

<option wicket:id="Script1" >jQuery (1.6.1)</option>

<option wicket:id="Script2" >prototype (1.7)</option>

</optgroup>

</select>

//Java 

import org.apache.wicket.extensions.markup.html.form.select.Select;

import org.apache.wicket.extensions.markup.html.form.select.SelectOption;

//variable to hold the selected value from dropdown box,

//and also make "jQuery" selected by default

private String selected = "jQuery";

Select languages = new Select("languages", new PropertyModel<String>(this, "selected"));

form.add(languages);

languages.add(new SelectOption<String>("framework1", new Model<String>("Wicket")));

languages.add(new SelectOption<String>("framework2", new Model<String>("Spring MVC")));

languages.add(new SelectOption<String>("framework3", new Model<String>("JSF 2.0")));

languages.add(new SelectOption<String>("Script1", new Model<String>("jQuery")));

languages.add(new SelectOption<String>("Script2", new Model<String>("prototype")));

 //HTML for dropdown box

<select wicket:id="languages">

<optgroup label="Frameworks">

<option wicket:id="framework1" >Wicket (1.4.7)</option>

<option wicket:id="framework2" >Spring MVC (3.0)</option>

<option wicket:id="framework3" >JSF (2.0)</option>

</optgroup>

<optgroup label="JavaScript">

<option wicket:id="Script1" >jQuery (1.6.1)</option>

<option wicket:id="Script2" >prototype (1.7)</option>

</optgroup>

</select>