Looking for all vbox controls and where and how they are used

I am trying to get a string to insert into a textbox that just text(value="some text")Is what I have and I need to get the  (mi.setAttribute("value", aURL);)
into the textbox of a vbox. 

                            <label value="Bookmark URL"/>
                            <textbox id="urltb" flex="1" value =" "/>

   mi.setAttribute("value", aURL);


------------------------------------------

Other code I found

<vbox anonid="infoContainer" align="center" pack="center" flex="1">
    <description anonid="info.title" class="info.title" hidden="true" />
    <description anonid="info.body" class="info.body"/>
</vbox>

<row anonid="loginContainer" hidden="true" align="center">
    <label anonid="loginLabel" value="&editfield0.label;" control="loginTextbox"/>
    <textbox anonid="loginTextbox"/>
</row>

<row anonid="password1Container" hidden="true" align="center">
    <label anonid="password1Label" value="&editfield1.label;" control="password1Textbox"/>
    <textbox anonid="password1Textbox" type="password"/>
</row>

<row anonid="checkboxContainer">
    <spacer/>
    <checkbox anonid="checkbox"/>
</row>


textbox.value = "First value";
textbox.setAttribute("value", "Second value");

<textbox value="rdf:http://mypage.com/my-schema#some-value" />

<textbox value="rdf:http://mypage.com/my-schema#some-value"
       DOMAttrModified="if(event.attrName == 'value') this.value = event.newValue; return true;" /> 

<label value="Some text here" />

<description value="Some very, very long text here" />

<description>Some very, very long text here</description>

<description style="white-space: pre;">Some very, very long text here</description>

<label value="rdf:http://mypage.com/my-schema#some-value" />

<description>
<text value="rdf:http://mypage.com/my-schema#some-value" />
</description>


<textbox class="plain" style="background-color: transparent;" flex="1"
        multiline="true" readonly="true"
        onoverflow="this.height = this.inputField.scrollHeight;"
        DOMAttrModified="if(event.attrName == 'value') this.value = event.newValue; return true;"
        value="rdf:http://mypage.com/my-schema#some-value" />