DropDownList inside UpdatePanel won't show

I have a dropdownlist inside an update-panel,

It's visible property is set to false and then I change it to true later but it will not show the dropdown?
<tr id="trTopics" runat="server" visible="false" >
	        <td colspan="3" class="PSRFItem">
		        <asp:UpdatePanel ID="updTopics" runat="server" >
			        <ContentTemplate>
				        <asp:Label ID="lblTopicError" runat="server" Visible="false" ForeColor="Red" CssClass="PIFErrorMessage" Text="You must specify the speakers intended topic." /><br />
				        <span style="color: Red; font-weight:bold; font-size: 18px;">*</span>
				        <asp:Label ID="lblTopic" runat="server" Text="What Topic would you like the speaker to present?" /><br />
				        <asp:DropDownList ID="ddlTopics" runat="server" AutoPostBack="True" />
			        </ContentTemplate>
		        </asp:UpdatePanel>
	        </td>
        </tr>

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meiprogramAsked:
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meiprogramConnect With a Mentor Author Commented:
I figured it out.

I had a drop-down-list that was depending on the user selection would show the tr tag.  I had this control in an update-panel as well, once I removed that update-panel all worked.
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Bill NolanOwner, Lead Technology ProgrammerCommented:
From your code it looks like its 'Visible' property is NOT set to false, though the enclosing table's visibility is false.  Not sure if you noticed this or not, but if you are simply setting the DropDownList visibility to true it won't matter.
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jkofteCommented:
the problem is with your tr tag. it is the parent to the dropdownlist, so when it is not visible, everything inside it will not be visible.

change

<tr id="trTopics" runat="server" visible="false" >

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to

<tr id="trTopics" runat="server">

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meiprogramAuthor Commented:
I know it will work if I take the visible out of the tr tag.  I need to hide that row and show it only in certain cases depending on the users input on other controls
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meiprogramAuthor Commented:
Figured it out myself.
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Bill NolanOwner, Lead Technology ProgrammerCommented:
Obviously users will not be able to make it visible again via the list.

Btw, your original problem description was inaccurate.
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