Combobox search result not visible

[Domantas]

I'm having problems with my combobox, when i press button (letter for element) I seek that corresponding element will highlight, which it does, however it is out of bounds.
I've attached picture, the hidden element is next after the last one visible that got highlighted, which is fine, however the user has to scroll a little bit more to actually see the element to which he was redirected to, how can I fix this?

                  Input = new RadComboBox                 {                 ID = "input_" + param.Name,                 EnableEmbeddedSkins = false,                 Skin = "Tabbed",                 AutoPostBack = true,                 Width = new Unit (100,UnitType.Percentage),                 Height = new Unit(100, UnitType.Percentage),                 DropDownCssClass = "Ellipsis",                 CssClass = "FullLength",                 MaxHeight = new Unit(220, UnitType.Pixel),                 CheckBoxes = Multiselect,                 EnableCheckAllItemsCheckBox = Multiselect //,ItemTemplate = CreateItemTemplate()                             };             Input.Style.Add ("margin-top", "5px");             Input.Style.Add ("margin-bottom", "5px");             if (!Multiselect)                 Input.SelectedIndexChanged += new RadComboBoxSelectedIndexChangedEventHandler(input_SelectedIndexChanged);             else                 {                 Input.ItemChecked += new RadComboBoxItemEventHandler(Input_ItemChecked);                 Input.CheckAllCheck += new RadComboBoxCheckAllCheckEventHandler(Input_CheckAllCheck);                 }

[Domantas]

I found out that somewhere in the code there was a label added to combobox which is first element, after delete'ing it in html, it works fine, what would I need to change in the code so it would see as there is an extra element in the grid? I suppose it thinks there is elements.count-1 instead of elements.count, so it does that

[Domantas]

I found out it is because of "EnableCheckAllItemsCheckBox"  attribute. I need it set to true, setting to false fixes the problem

[Domantas]

I can manage to make the element visible (search by key pressed) just fine if i make the list in relative position, however if I do that, when the user opens the drop down the first element is skipped (scrollbar not at the top) and therefore is not visible to the user, as a result it solves the problem but creates another one.