It works properly for single calendar.

The focused date for the calendar is not applied initially when setting it via code behind.

If I do this via code behind:
            theControl.Calendar.RangeMinDate = new DateTime(2012, 1, 1);
            theControl.Calendar.RangeMaxDate = new DateTime(2012, 12, 31);
            theControl.Calendar.FocusedDate = new DateTime(2012, 1, 2);

When clicking on the button to select a date, I get a "Date is out of range" message box. but then it still allows me to pick a date.

The only workaround I have been able to use right now is to set the Focused date in the markup. This will allow the selection without the popup.

I am having an issue exporting data from a Radgrid when using a Radbutton. Even though I disable the AjaxManager from the code behind the Radgrid wound't export the data. However if I click the button a second time the export window opens, but the file doesn't contain any data. Is there some easy work around in order to fix this issue. If I completely remove the AjaxManager the problem is solved, but makes the usage and layout of the site bad. 

Here is my code...

ASPX:
<telerik:RadAjaxManager ID="RadAjaxManager1" runat="server" >
    <ClientEvents OnRequestStart="RequestStart" OnResponseEnd="ResponseEnd" />
        <AjaxSettings>
            <telerik:AjaxSetting AjaxControlID="btn_Search">
                <UpdatedControls>
                    <telerik:AjaxUpdatedControl ControlID="RG_DataList" LoadingPanelID="ContentLoadingPanel" />
                    <telerik:AjaxUpdatedControl ControlID="datePickersBar" />
                    <telerik:AjaxUpdatedControl ControlID="btn_Export" UpdatePanelRenderMode="Inline" />
                </UpdatedControls>
            </telerik:AjaxSetting>
            <telerik:AjaxSetting AjaxControlID="btn_Export">
                <UpdatedControls>
                    <telerik:AjaxUpdatedControl ControlID="" />
                </UpdatedControls>
            </telerik:AjaxSetting>
        </AjaxSettings>
     </telerik:RadAjaxManager>

<div class="datePickers" id="datePickersBar">
			    <span class="sText">Select period from: </span>
			    <telerik:RadDatePicker ID="RDP_StartDate" runat="server" Culture="da-DK" 
                    HiddenInputTitleAttibute="Visually hidden input created for functionality purposes." 
                    WrapperTableSummary="Table holding date picker control for selection of dates." >
                        <Calendar UseRowHeadersAsSelectors="False" UseColumnHeadersAsSelectors="False" ViewSelectorText="x" runat="server"></Calendar>

                        <DateInput DateFormat="dd-MM-yyyy" DisplayDateFormat="dd-MM-yyyy" AutoPostBack="false" LabelWidth="40%" runat="server" ></DateInput>

                        <DatePopupButton ImageUrl="" HoverImageUrl=""></DatePopupButton>
			    </telerik:RadDatePicker>
			    
			 <span class="sText">to: </span>
		        <telerik:RadDatePicker ID="RDP_FinishDate" runat="server" 
                    Culture="da-DK" 
                    HiddenInputTitleAttibute="Visually hidden input created for functionality purposes." 
                    
                    WrapperTableSummary="Table holding date picker control for selection of dates." >
                        <Calendar UseRowHeadersAsSelectors="False" UseColumnHeadersAsSelectors="False" ViewSelectorText="x"></Calendar>

                        <DateInput DisplayDateFormat="dd-MM-yyyy" DateFormat="dd-MM-yyyy" LabelWidth="40%" ></DateInput>

                        <DatePopupButton ImageUrl="" HoverImageUrl=""></DatePopupButton>
			    </telerik:RadDatePicker>
                &nbsp;&nbsp;&nbsp;&nbsp;
                <telerik:RadButton ID="btn_Search" runat="server" Text="Search" 
                    onclick="btn_Search_Click" Skin="Black" >
                </telerik:RadButton>
                &nbsp;&nbsp;&nbsp;&nbsp;
                <telerik:RadButton ID="btn_Export" runat="server" Text="Export" Skin="Black" 
                    Enabled="false" Visible="true" onclick="btn_Export_Click" 
                    AutoPostBack="true" >
                </telerik:RadButton>
		    </div>
	    
	    <div class="content">
		    <asp:Panel runat="server" ID="Content">
                <telerik:RadAjaxLoadingPanel runat="server" ID="ContentLoadingPanel" 
                        IsSticky="True" CssClass="ajaxLoader" MinDisplayTime="500" 
                        EnableSkinTransparency="False" Skin="Black" />
                <telerik:RadGrid ID="RG_DataList" runat="server" Skin="Default" 
                    onprerender="RG_DataList_PreRender" >
                    <MasterTableView >
                        <CommandItemSettings ShowExportToExcelButton="true"></CommandItemSettings>
                    </MasterTableView>
                    <ExportSettings HideStructureColumns="true" ExportOnlyData="true" IgnorePaging="true" OpenInNewWindow="true">
                        <Excel Format="Biff"></Excel>
                    </ExportSettings>
                    <FilterMenu EnableImageSprites="False"></FilterMenu>
                </telerik:RadGrid>
            </asp:Panel>
	    </div>

CS:
protected void btn_Search_Click(object sender, EventArgs e)
    {
        mergeDataTable();
        btn_Export.Enabled = true;
    }

rotected void btn_Export_Click(object sender, EventArgs e)
    {
        RadAjaxManager1.EnableAJAX = false;

        RG_DataList.ExportSettings.ExportOnlyData = true;
        RG_DataList.ExportSettings.IgnorePaging = true;
       // RG_DataList.ExportSettings.OpenInNewWindow = true;
        RG_DataList.MasterTableView.ExportToExcel();
    }

I am using Header Context Filter Menu for the RadGrid.I found the two different filter options with that but there is an "And" option where "Or" option makes more sense to use with compare to "And".Even I did not finding any option on RadGrid to change this "And" option to "Or". Waiting for you kind response if you have any work arround or fix for this as i am in b/w of the development and found this. So let me know as early as possible.

I have a Rad Grid with modal popup option for insert and update operation. When i insert or update some record for this rad grid the modal pop up doesn't close by clicking on save button in Internet Explorer 10 and hence the record is not saved. It works fine with previous versions of Internet Explorer and also with other browsers like Chrome and Firefox. Find the attachment for a related snapshot.

Clicking on header column of GridClientSelectColumn grid row checkboxes remains unchecked. The grid rows becomes selected (style changed) though.
The issue appears only in IE 11, Chrome, Firefox and IE 10 work as expected.
The issue can be reproduced om Telerik's site:
http://demos.telerik.com/aspnet-ajax/grid/examples/functionality/selecting/row-selection/defaultcs.aspx

It seems not to be related to Compabitibiity View.

With the current implementation if the RenderMode is set to Auto in the web.config file it is later automatically changed to Leightweight instead of Mobile.