Hi,
I will provide you code sample and I believe that this will help you to solve the problem.
I have created custom webpart and in mywebpart.ascx put following code:
<asp:Panel ID="myPanel" runat="server">
<asp:Literal runat="server" ID="ltl" ></asp:Literal>
</asp:Panel>
and into mywebpart.ascx.cs to Page_Load put:
CMS.DocumentEngine.TreeProvider tree = new CMS.DocumentEngine.TreeProvider(CMS.CMSHelper.CMSContext.CurrentUser);
CMS.DocumentEngine.TreeNode tn = tree.SelectSingleNode(CMS.CMSHelper.CMSContext.CurrentDocument.NodeID);
string test = ValidationHelper.GetString(tn.GetValue("Areal"), string.Empty);
ltl.Text = CMS.GlobalHelper.ResHelper.LocalizeString(test);
CMS.ExtendedControls.ControlsHelper.ResolveDynamicControls(myPanel);
And this help me to resolved the text literal which you have post in your first post ("Areal" is the field where I store youtube video).
Best Regards,
Roman Konicek