ired flag can be set by external controls
					function _ctl0_ContentMain_dpToDate_DateValidate(source, arguments)
					{
						if(_ctl0_ContentMain_dpToDate_Required == true)
						{
							// Get handle to text boxes
							var txtDate = document.getElementById('_ctl0_ContentMain_dpToDate_txtDate');

							if((txtDate != null && txtDate.value.length == 0))
							{
								arguments.IsValid = false;
								_ctl0_ContentMain_dpToDate_SetErrorMessage('_ctl0_ContentMain_dpToDate_valRequired','')