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dhtmlxCombo - List length

Hello,

i am instantiating a combobox via script:

<div id="query_entry[1].operatorBox"></div>
<script>

var z1 = new dhtmlXCombo("query_entry[1].operatorBox","z1",42,'image');
z1.addOption([
{value:"EQ",text:"",css:"padding-left:0px",img_src:"../../images/s_BGEQUA.gif"},
{value:"GE",text:"",css:"padding-left:0px",img_src:"../../images/s_BGGREQ.gif"},
{value:"GT",text:"",css:"padding-left:0px",img_src:"../../images/s_BGGREA.gif"},
{value:"LE",text:"",css:"padding-left:0px",img_src:"../../images/s_BGLEEQ.gif"},
{value:"LT",text:"",css:"padding-left:0px",img_src:"../../images/s_BGLESS.gif"},
{value:"NE",text:"",css:"padding-left:0px",img_src:"../../images/s_BGNEQU.gif"},
{value:"BT",text:"",css:"padding-left:0px",img_src:"../../images/s_BGIVIN.gif"},
{value:"NB",text:"",css:"padding-left:0px",img_src:"../../images/s_BGIVEX.gif"}]);
z1.enableOptionAutoHeight(true);
z1.attachEvent("onSelectionChange",onSelectionChangeFunc);

function onSelectionChangeFunc()
{
return htmlbSL(this,2,'change:change','');
}
</script>

I want to have only pictures, so i set new dhtmlXCombo("query_entry[1].operatorBox","z1",42,'image');
That seems to be the smallest value, without running into javascript errors.

But if the user presses the value help i will get a listbox with too many empty entries at the end. How can i set the length exactly so, that exctaly the 8 entries appear without any scrolling slider?

Best regards,

Stefan
z1.enableOptionA

PS: using z1.enableOptionAutoHeight(true); does not effect anything :-(

... no :-(