title: How to get Item.LookupData and SelectedValue (as integer) of an FMX TComboBox at runtime?
body: <p>There is a <code>ComboBox</code> on the FMX Form. It is binded with a datasource (table that has an <code>id</code>-integer and <code>speciality</code> - varchar fields) in the following manner-</p>
  
  <pre><code>object LinkFillControlToField1: TLinkFillControlToField
        Category = 'Quick Bindings'
        Control = ComboBox1
        Track = True
        FillDataSource = BindSourceDB1
        FillValueFieldName = 'id'
        FillDisplayFieldName = 'speciality'
        AutoFill = True
        BufferCount = -1
        AutoBufferCount = False
        FillExpressions = &lt;&gt;
        FillHeaderExpressions = &lt;&gt;
        FillBreakGroups = &lt;&gt;
      end
  </code></pre>
  
  <p>It is simple to get access to the value of chosen <code>speciality</code> (from <code>ComboBox1.Selected.Text</code>) but I can not find a way to access the <code>id</code> value of the selected item without extra SQL requests. Where is it stored in TComboBox or its ListBox? Where is <code>SelectedValue</code> stored and how to get it (as integer)?</p>