or
<telerik:RadComboBox runat="server" ID="lstFoodStorage" OnClientLoad="onLoad"> <Items> <telerik:RadComboBoxItem runat="server" Text="FoodStorage" /> <telerik:RadComboBoxItem runat="server" Text="Freezer" /> <telerik:RadComboBoxItem runat="server" Text="Fridge" /> <telerik:RadComboBoxItem runat="server" Text="Microwave" /> <telerik:RadComboBoxItem runat="server" Text="OnTheGo" /> <telerik:RadComboBoxItem CssClass="rcbitemlast" runat="server" Text="Pantry" /> </Items></telerik:RadComboBox><script type="text/javascript" language="javascript"> function onLoad(sender) { var div = sender.get_element(); $telerik.$(div).bind('mouseenter', function () { if (!sender.get_dropDownVisible()) sender.showDropDown(); }); $telerik.$(".RadComboBoxDropDown").mouseleave(function (e) { hideDropDown("#" + sender.get_id(), sender, e); }); $telerik.$(div).mouseleave(function (e) { hideDropDown(".RadComboBoxDropDown", sender, e); }); } function hideDropDown(selector, combo, e) { var tgt = e.relatedTarget; var parent = $telerik.$(selector)[0]; var parents = $telerik.$(tgt).parents(selector); if (tgt != parent && parents.length == 0) { if (combo.get_dropDownVisible()) combo.hideDropDown(); } }</script>$telerik.$(".RadComboBoxDropDown") does not recognize the RadDropDownLists. It is only for ComboBoxes.<telerik:RadDropDownList ID="RadDropDownAreaList" Visible="true" runat="server" Width="300px"
DropDownHeight="200px">
</telerik:RadDropDownList>
<asp:CompareValidator runat="server" ID="Comparevalidator1" ValueToCompare="- Select -"
Operator="NotEqual" ControlToValidate="RadDropDownAreaList" ErrorMessage="Required"
ValidationGroup="e" />

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