I write simple WebPart with few asp.net controls. I have problem with validation control and SharePoint date time control. The markup: <SharePoint:DateTimeControl ID="dtc" runat="server" ...
There is a DateTimeControl on my WebPage which i is a ReqiredField. I have set the properties of the control as follows <SharePoint:DateTimeControl runat="server" ID="txtDOB" DateOnly="True" ...