Telerik RadComboBox is a composite control consisting of an input area, dropdown and dropdown image. Therefore, the AssociatedControlID property of the Label control cannot automatically detect which part of the combobox should be focused.
There is, however, a relatively easy workaround with a few lines of javascript. Just define your label and the combobox and after their declaration add the following javascript code:
Example:
| ASPX |
 Copy Code |
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<asp:Label
ID="Label1"
runat=server
AccessKey="O"
AssociatedControlID="RadComboBox1"
Text="<u>E</u>nter Text:">
</asp:Label>
<radcb:RadComboBox
id="RadComboBox1"
Runat="server"
AllowCustomText="True">
</radcb:RadComboBox> |
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<script type="text/javascript">
var comboBoxInstance = <%= RadComboBox1.ClientID %>
var comboBoxInputElement = document.getElementById(comboBoxInstance.InputID);
var labelElement = document.getElementById("<%= Label1.ClientID %>");
labelElement.htmlFor = comboBoxInputElement.id;
</script> |