There are two possible approaches to overcome this issue:
- First approach would be to get a reference to the GridHTMLEditorColumn and add the desired tools in the code behind using the "OnItemCreated" server event handler of RadGrid.
- Second approach would be to use GridTemplateColumn with RadEditor.

The reason for the behavior is that the column editor does not move to the cell when you cancel its opening. Opening a cell in the same column expects the column editor to be in the previously opened cell, however, and this causes the error. Repro is attached to illustrate the scenario.

Workarounds:
- Use EditType=Cell so that each cell opens independently of the row (wokaround 1).
- Use the provided function override (workaround 2). Make sure to remove it after upgrading to a release that has the fix. This function override may prevent you from getting other updates and fixes in this function.
- Use a template column and hide the editor based on your condition in the OnBatchEditOpened event (workaround 3)

If the selection mode of the Grid is different than row selection, no cell of the detailed grid gets selected. The bug is introduced with version 2016 R3 SP1

Steps to reproduce:
1. Run the following demo locally  http://demos.telerik.com/aspnet-ajax/grid/examples/hierarchy/declarative-relations/defaultcs.aspx

2. and add this configuration:
       <telerik:RadGrid ...>
            <ClientSettings>
                <Selecting CellSelectionMode="SingleCell" />
            </ClientSettings>

If there are hidden columns before the ColumnGroups while exporting to excel (format Xlsx), header text of columngroups are shifted to the left.

 - Workaround, is to move the hidden column after the ColumnGroups.

To overcome this issue you can do the following:

- For anchor links (a) implement onclick event with window.location.
- For submit buttons set UseSubmitBehavior property to false.

Th header context menu of the Grid gets closed on click (select/deselect a column) if the Grid is initially scrolled horizontally.

Video: https://www.screencast.com/t/Gm1FLHia


Steps to reproduce:
    1. Open the Live Demos solution for "UI for ASP.NET AJAX R1 2017" in VS2015;
    2. Open the page "UI for ASP.NET AJAX R1 2017\Live Demos\Grid\Examples\Functionality\Scrolling\scrolling\DefaultCS.aspx";
    3. Enable the HeaderContextMenu by setting EnableHeaderContextMenu="True" in the tag telerik:RadGrid;
    4. Disable the column freezing.
    5. Run the Demo and open the page "Grid\Examples\Functionality\Scrolling\scrolling\DefaultCS.aspx";
    6. Scroll the horizontal scrollbar of the grid to the right;
    7. Right click on the column header and pick the Columns from the context menu;
    8. Select or unselect any column, the Column Chooser will close by itself;
    9. Now, scroll the horizontal scrollbar of the grid all the way to the left;
    10. Right click on the column header and pick the Column Chooser from the context menu;
    11. Select or unselect any columns, the Column Chooser won't close by itself.

It seems the element somehow considmes the scrolling/touch action and the grid does not scroll unless you hit the gap where the custom element does not reach.

A workaround is to enforce overflow: auto to the scrollable element of the grid. A sample is attached below.

        div.rgDataDiv {
            overflow: auto !important;
        }

Add support for custom paging in the RadGrid Virtualization functionality. The idea is to enable the retrieval of part of the data from the source of data instead of retrieving all of the data every time.

Without this feature the optimization technique is to cache the data source.

Example is available at http://www.telerik.com/support/kb/aspnet-ajax/grid/details/virtualization-and-custom-paging

The Filtering context menu is not positioned properly when there is not enough height. It is positioned depending on the top border of the window, making the filters not accessible.

Screencast: https://www.screencast.com/t/4dQEAczF9c2

Steps to reproduce:
1. Open http://demos.telerik.com/aspnet-ajax/grid/examples/functionality/filtering/excel-like-filtering/defaultcs.aspx
2. Resize the browser so the last elements of the Grid are not visible
3. Open the Filtering context menu

Result: It is shown with too big negative top margin

If a column does not have width set, it will not populate the Columns collection of the ExportInfrastructure in the BiffExprorting event http://docs.telerik.com/devtools/aspnet-ajax/controls/grid/functionality/exporting/export-formats/excel-biff-export

To be able to loop through all columns, you need to have width specified for them.

This change has been introduced in Q3 2014

If you cannot do this for the standard grid rendering when defining columns, you can use the Grid.PreRender event to loop all columns and set some width for them:


VB

    Protected Sub RadGrid1_PreRender(ByVal sender As Object, ByVal e As System.EventArgs) Handles RadGrid1.PreRender

        'workaround for BiffExporting event Columns collection not being populated if the column does not have width set
        Dim Grid As RadGrid = DirectCast(sender, RadGrid)
        If (Grid.IsExporting) Then
            For index = 0 To Grid.MasterTableView.Columns.Count - 1
                Grid.MasterTableView.Columns(index).HeaderStyle.Width = 100
            Next
        End If
    End Sub


C#

protected void RadGrid1_PreRender(object sender, System.EventArgs e)
{
	//workaround for BiffExporting event Columns collection not being populated if the column does not have width set
	RadGrid Grid = (RadGrid)sender;
	if ((Grid.IsExporting)) {
		for (index = 0; index <= Grid.MasterTableView.Columns.Count - 1; index++) {
			Grid.MasterTableView.Columns(index).HeaderStyle.Width = 100;
		}
	}
}

Simply add a Column to RadGrid in the GridColumn Collection Editor of the Configuration wizard. You will note that a value for FilterControlAltText is autopopulated. When you hit Ok, that value is written in the column definition, in markup. If you clear that text in the editor, then, in markup you will find the value FilterControlAltText ="". This is useless clutter, which you should manually remove from the markup. The editor/designer should remove the property entry from markup if you clear the FilterControlAltText from the PropertyGrid in the GridColumn Collection Editor.

https://www.screencast.com/t/4BCjMdLqQS5

A workaround is to access the column and replace the text of the cell with a <label> control. Examples are attached below

Misalignment issue in RadGrid with static headers and simple control's configuration appears in IE.

The manually entered value of RadDateTimePicker is replaced with the original one in Batch Edid mode in iPad.

To reproduce this incorrect behavior add a new 

<telerik:GridDateTimeColumn HeaderText="Start Date" UniqueName="StartDate" DataField="StartDate" DataFormatString="{0:MM/dd/yyyy}">
            </telerik:GridDateTimeColumn>

column in the Batch Edit demos of RadGrid and test under iPad. 

Tap over RadTextBox, enter some new date and press Go/tap out and you'll see the problem.

The navigation icons are not readable in mobile Grid in MetroTouch.

Video: https://goo.gl/TrzZ0m

Steps to reproduce:
1. Open this demo:
http://demos.telerik.com/aspnet-ajax/grid/mobile-examples/overview/default.aspx?skin=MetroTouch

Result: the Navigation icons are white

Workaround for the NextPrevAndNumeric mode is to set the AssociatedControlID of the label

	protected void RadGrid1_ItemDataBound(object sender, GridItemEventArgs e)
	{
		if (e.Item is GridPagerItem)
		{
			GridPagerItem pager = e.Item as GridPagerItem;
			Label lbl = pager.FindControl("ChangePageSizeLabel") as Label;
			Panel pnl = lbl.Parent as Panel;
			RadComboBox combo = pnl.FindControl("PageSizeComboBox") as RadComboBox;
			lbl.AssociatedControlID = combo.ID;
		}
	}

	<telerik:RadGrid RenderMode="Lightweight" ID="RadGrid1" runat="server" DataSourceID="SqlDataSource1" AllowSorting="True"
						AllowPaging="True" GridLines="None" Width="100%" OnItemDataBound="RadGrid1_ItemDataBound">
		<PagerStyle Mode="NextPrevAndNumeric" Position="TopAndBottom" PageSizeControlType="RadComboBox"></PagerStyle>
	</telerik:RadGrid>
			
	<asp:SqlDataSource ID="SqlDataSource1" ConnectionString="<%$ ConnectionStrings:NorthwindConnectionString %>"
						ProviderName="System.Data.SqlClient" SelectCommand="SELECT CustomerID, CompanyName, ContactName, ContactTitle, Address, PostalCode FROM Customers"
						runat="server"></asp:SqlDataSource>

Currently Linq2Sql expressions are supported. But as Entity Framework is "de facto" the standard for data access in .NET, it would be great, if you also support ESQL expressions.

This is necessary for example when data binding to entities in OnNeedDataSource event and filter expressions from RadGrid should be used for adapting query.

Thanks,
Roger