Use Custom Modal Advanced Template

When the advanced form is modal (), it relies on a special CSS class to be displayed properly - rsAdvancedEdit. When using the advanced templates, you need to make sure that you wrap your content within a container which has this class. There are also other CSS classes which you can reuse such as rsAdvInnerTitle or rsAdvEditClose. Here is an example:

ASPNET

	<AdvancedEditTemplate>
   <div class="rsAdvancedEdit rsAdvancedModal" style="position: relative">
	   <div class="rsModalBgTopLeft">
	   </div>
	   <div class="rsModalBgTopRight">
	   </div>
	   <div class="rsModalBgBottomLeft">
	   </div>
	   <div class="rsModalBgBottomRight">
	   </div>     
	   <div class="rsAdvTitle">          
		   <h1 class="rsAdvInnerTitle">
			   <%# Container.Appointment.Owner.Localization.AdvancedEditAppointment %></h1>
		   <asp:LinkButton runat="server" ID="LinkButton1" CssClass="rsAdvEditClose"
			   CommandName="Cancel" CausesValidation="false" ToolTip='<%# Container.Appointment.Owner.Localization.AdvancedClose %>'>
<%# Container.Appointment.Owner.Localization.AdvancedClose%>
		   </asp:LinkButton>
	   </div>
	   <div class="rsAdvContentWrapper">
		   <telerik:RadTextBox RenderMode="Lightweight" ID="SubjectTextBox" runat="server" Text='<%# Bind("Subject") %>'
			   Label='<%# Container.Appointment.Owner.Localization.AdvancedSubject%>'>
		   </telerik:RadTextBox>
		   <p>
			   Custom content here...
		   </p>
		   <asp:Panel runat="server" ID="Panel1" CssClass="rsAdvancedSubmitArea">
			   <div class="rsAdvButtonWrapper">
				   <asp:LinkButton CommandName="Update" runat="server" ID="LinkButton2" CssClass="rsAdvEditSave">
<span><%# Container.Appointment.Owner.Localization.Save%></span>
				   </asp:LinkButton>
				   <asp:LinkButton runat="server" ID="LinkButton3" CssClass="rsAdvEditCancel" CommandName="Cancel"
					   CausesValidation="false">
<span><%# Container.Appointment.Owner.Localization.Cancel%></span>
				   </asp:LinkButton>
			   </div>
		   </asp:Panel>
	   </div>
   </div>
</AdvancedEditTemplate> 

ASPNET

	<AdvancedInsertTemplate>
   <div class="rsAdvancedEdit rsAdvancedModal" style="position: relative">
	   <div class="rsModalBgTopLeft">
	   </div>
	   <div class="rsModalBgTopRight">
	   </div>
	   <div class="rsModalBgBottomLeft">
	   </div>
	   <div class="rsModalBgBottomRight">
	   </div>     
	   <div class="rsAdvTitle">          
		   <h1 class="rsAdvInnerTitle">
			   <%# Container.Appointment.Owner.Localization.AdvancedNewAppointment %></h1>
		   <asp:LinkButton runat="server" ID="AdvancedEditCloseButton" CssClass="rsAdvEditClose"
			   CommandName="Cancel" CausesValidation="false" ToolTip='<%# Container.Appointment.Owner.Localization.AdvancedClose %>'>
<%# Container.Appointment.Owner.Localization.AdvancedClose%>
		   </asp:LinkButton>
	   </div>
	   <div class="rsAdvContentWrapper">
		   <telerik:RadTextBox RenderMode="Lightweight" ID="SubjectTextBox" runat="server" Text='<%# Bind("Subject") %>'
			   Label='<%# Container.Appointment.Owner.Localization.AdvancedSubject%>'>
		   </telerik:RadTextBox>
		   <p>
			   Custom content here...
		   </p>
		   <asp:Panel runat="server" ID="ButtonsPanel" CssClass="rsAdvancedSubmitArea">
			   <div class="rsAdvButtonWrapper">
				   <asp:LinkButton CommandName="Update" runat="server" ID="UpdateButton" CssClass="rsAdvEditSave">
<span><%# Container.Appointment.Owner.Localization.Save%></span>
				   </asp:LinkButton>
				   <asp:LinkButton runat="server" ID="CancelButton" CssClass="rsAdvEditCancel" CommandName="Cancel"
					   CausesValidation="false">
<span><%# Container.Appointment.Owner.Localization.Cancel%></span>
				   </asp:LinkButton>
			   </div>
		   </asp:Panel>
	   </div>
   </div>
</AdvancedInsertTemplate>