How to use <apex:toolbarGroup>  in Visualforce Page?

<apex:toolbarGroup> :
A group of components within a toolbar that can be aligned to the left or right of the toolbar. The < apex:toolbarGroup > component must be a child component of an < apex:toolbar >.

This tag supports following attributes:

Attribute	Description
id	An identifier that allows the toolbarGroup component to be referenced by other components in the page.
itemSeparator	The symbol used to separate toolbar components in the toolbarGroup. Possible values include "none", "line", "square", "disc", and "grid". If not specified, this value defaults to "none".
location	The position of the toolbarGroup in the toolbar. Possible values include "left" or "right". If not specified, this value defaults to "left".
onclick	The JavaScript invoked if the onclick event occurs that is, if the userclicks the toolbarGroup.
ondblclick	The JavaScript invoked if the ondblclick event occurs that is, if the user clicks the toolbarGroup twice.
onkeydown	The JavaScript invoked if the onkeydown event occurs that is, if the user presses a keyboard key.
onkeypress	The JavaScript invoked if the onkeypress event occurs that is, if the user presses or holds down a keyboard key.
onkeyup	The JavaScript invoked if the onkeyup event occurs that is, if the user releases a keyboard key.
onmousedown	The JavaScript invoked if the onmousedown event occurs that is, if the user clicks a mouse button.
onmousemove	The JavaScript invoked if the onmousemove event occurs that is, if the user moves the mouse pointer.
onmouseout	The JavaScript invoked if the onmouseout event occurs that is, if the user moves the mouse pointer away from the toolbarGroup component.
onmouseover	The JavaScript invoked if the onmouseover event occurs that is, if the user moves the mouse pointer over the toolbarGroup component.
onmouseup	The JavaScript invoked if the onmouseup event occurs that is, if the user releases the mouse button.
rendered	A Boolean value that specifies whether the component is rendered on the page. If not specified, this value defaults to true.
separatorClass	The style class used to display the toolbar component separator, used primarily to designate which CSS styles are applied when using an external CSS stylesheet. See also the itemSeparator attribute.
style	The CSS style used to display the toolbar group, used primarily for adding inline CSS styles.
styleClass	The style class used to display the toolbar group, used primarily to designate which CSS styles are applied when using an external CSS stylesheet.

Visualforce Example:

<apex:page id="thePage">

    <apex:toolbar id="theToolbar">

        <apex:outputText value="Sample Toolbar"/>

        <apex:toolbarGroup itemSeparator="line" id="toobarGroupLinks">

            <apex:outputLink value="http://www.salesforce.com">salesforce</apex:outputLink>

            <apex:outputLink value="http://developer.salesforce.com">apex developer network</apex:outputLink>

        </apex:toolbarGroup>

        <apex:toolbarGroup itemSeparator="line" location="right" id="toobarGroupForm">

            <apex:form id="theForm">

                <apex:inputText id="theInputText">Enter Text</apex:inputText>

                <apex:commandLink value="search" id="theCommandLink"/>

            </apex:form>

        </apex:toolbarGroup>

    </apex:toolbar>

</apex:page>