asp:label doesn't render children - asp.net

Question

I have an asp:label with a nested custom control and it simply doesn't render. I tried to register a custom WebControlAdapter for Label type and while debugging I noticed that there is apparently no control in the Controls collection, it seems to be completely ignoring any nested elements.
Here's markup
<asp:Label ID="lbl13" runat="server" AssociatedControlID="txt13" Text="<%$ Resources:Resources, lbl13 %>">
<asp:ValidationMessage ID="vm13" runat="server" MessageFor="txt13" CssClass="field-validation-error"></asp:ValidationMessage>
</asp:Label>
Any idea how to bypass this problem?

Answer 1

When you set the Text property, it clears the child controls. If you remove the Text="<%$ Resources:Resources, lbl13 %>" from the Label, your child controls should render.
EDIT
If you set the Text property to a static string and add only literal content, the label will only render the literal content:
<asp:Label runat="server" Text="Hello"> World</asp:Label>
Output: World
If you set the Text property to a static string and add child controls, the label will render the text and the child controls:
<asp:Label runat="server" Text="Hello">
<asp:Label runat="server" Text="World" />
</asp:Label>
Output: HelloWorld
If you set the Text property using an expression builder, the label will only render the text:
<asp:Label runat="server" Text="<%$ Resources:Resources,Hello %>">
<asp:Label runat="server" Text="World" />
</asp:Label>
Output: Localised version of "Hello"
To override this behaviour, you'll need a custom Label control. For example:
public class MyLabel : Label
{
public override string Text
{
get { return base.Text; }
set
{
if (HasControls())
{
Controls.AddAt(0, new LiteralControl(value));
}
else
{
base.Text = value;
}
}
}
}