textbox dropdown extender

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ASP.NET

Ajax

I am trying to get a dropdownlist tied to a textbox using the dropdown extender. I am able to get it working except the drop down list does not expand to show all items, unless you hold down the mouse button and drag the mouse. Is there a way to force the dropdownlist to expand and wait until an item is selected? Is there a better alternative to accomplish the same thing?

 <asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("Reviewer1Title") %>' />  
                                     <asp:DropDownExtender ID="TextBox1_DropDownExtender" runat="server" 
                                        DynamicServicePath="" Enabled="True" TargetControlID="TextBox1" DropDownControlID="DropDownList3">
                                    
                                    <asp:DropDownList ID="DropDownList3" runat="server" 
                                        DataSourceID="SqlDataSource1" DataTextField="Reviewer1Title" 
                                        DataValueField="Reviewer1Title">
                                    
                                    <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
                                        ConnectionString="<%$ ConnectionStrings:PKLConnectionString %>" SelectCommand="SELECT tblEvaluationListing.Reviewer1Title
FROM tblEvaluationListing
GROUP BY tblEvaluationListing.Reviewer1Title
HAVING ((Not (tblEvaluationListing.Reviewer1Title) Is Null));">