When I placed ajaxtoolkit combobox in a tabpane of tabcontainer, the drodownbutton and drop down list display are display. Here is my code.

 <form id="form1" runat="server">  <asp:ScriptManager ID="scriptManager1" runat="server"></asp:ScriptManager> 

 <div>  <ajaxToolkit:TabContainer ID="TabContainer1" runat="server" ActiveTabIndex="1"

 Height="228px" Width="400px">

 <ajaxToolkit:TabPanel ID="tabpane1" runat="server" HeaderText="tab1">  <HeaderTemplate> Tab 1</HeaderTemplate> 
<ContentTemplate>

<br />
<ajaxToolkit:ComboBox runat="server" ID="ComboBox1" MaxLength="100" AutoCompleteMode="Suggest" > 
<asp:ListItem Text="ABC" Value="ABC"></asp:ListItem> 
<asp:ListItem Text="XYZ" Value="XYZ"></asp:ListItem>
</ajaxToolkit:ComboBox>
</ContentTemplate> 
</ajaxToolkit:TabPanel> 
<ajaxToolkit:TabPanel ID="TabPanel2" runat="server" HeaderText="Tab2"> 
<HeaderTemplate>
Tab 2
</HeaderTemplate> 
<ContentTemplate> 
<br /> 

<ajaxToolkit:ComboBox runat="server" ID="ComboBox4" MaxLength="100" AutoCompleteMode="Suggest"  <asp:ListItem Text="ABC" Value="ABC"></asp:ListItem> <asp:ListItem Text="XYZ" Value="XYZ"></asp:ListItem>

</ajaxToolkit:ComboBox> </ContentTemplate></ajaxToolkit:TabPanel> </ajaxToolkit:TabContainer> 
</div>
</form>

The drop down in the second tab is not showing properly. Its button and lists not showing when I click this tab from first tabe. 

Hi SMuhilan,

Please refer to my reply in this thread:
http://forums.asp.net/p/1433635/3238466.aspx#3238466

Best regards,

Zhi-Qiang Ni

 Hi

Thanks for reply.

As per Design of this project, it is not possible to add the comboboxes in runtime. Is their any other way round solution exists? i.e modifing Ajax toolkit code?

Regards

S. Muhilan

 Hi

Any one is their to resolve this bug?

Regards

S. Muhilan