Hi, 

Heres a simple one: I have a dynamic grid `MasterTableView.EnableColumnsViewState = false;` on page init and all works fine. However, when the client/browser show a dynamic column thats hidden (or vise versa), and the column is gone on postback (being a dynamic grid this can happen), the LoadClientState tries to get the column - and if it fails to, it breaks down hard.. Instead it should just ignore it, as its just a pretty un-important show/hide state.

Your RadGrid code goes something like this:

LoadClientState ->
if (clientState.ContainsKey("showedColumns")) ->
control.GetColumn(columnUniqueName).Display = true; <-- just ignore this if not found - also on the others like hide, resize etc.

Thank you!... +1 for making this html editor a MD flavor instead :)

/Anders

Upon inserting a new record after filtering on the Grid with No records, the exception "No property or field 'Name' exists in type 'DataRowView'" is thrown.

Steps to reproduce:

1. Bind the Grid to an empty data source at initial load
2. Filter any column
3. Insert a new record

Code to replicate the issue:

<telerik:RadGrid ID="RadGrid1" runat="server" AutoGenerateColumns="false" AllowFilteringByColumn="true"
    OnNeedDataSource="RadGrid1_NeedDataSource" OnInsertCommand="RadGrid1_InsertCommand">
    <MasterTableView CommandItemDisplay="Top" DataKeyNames="ID">
        <Columns>
            <telerik:GridEditCommandColumn></telerik:GridEditCommandColumn>
            <telerik:GridButtonColumn CommandName="Delete"></telerik:GridButtonColumn>

            <telerik:GridBoundColumn DataField="ID" HeaderText="ID" UniqueName="ID" ReadOnly="true"
                CurrentFilterFunction="Contains" AutoPostBackOnFilter="true" />

            <telerik:GridBoundColumn DataField="Name" HeaderText="Name" UniqueName="Name"
                AutoPostBackOnFilter="false" />

            <telerik:GridBoundColumn DataField="Category" HeaderText="Category" UniqueName="Category" DataType="System.String"
                CurrentFilterFunction="Contains" AutoPostBackOnFilter="true" />

            <telerik:GridBoundColumn DataField="Price" HeaderText="Price" UniqueName="Price"
                CurrentFilterFunction="Contains" AutoPostBackOnFilter="true" DataFormatString="{0:C}" />
        </Columns>
        <EditFormSettings InsertCaption="Add New Item" />
    </MasterTableView>
</telerik:RadGrid>

C#

private const string DataTableSessionKey = "RadGridDataTable";
private DataTable SessionDataSource
{
    get
    {
        DataTable dt = Session[DataTableSessionKey] as DataTable;

        if (dt == null || !IsPostBack)
        {
            // Create an empty DataTable with schema defined
            dt = new DataTable();

            dt.Columns.Add("ID", typeof(int));
            dt.Columns.Add("Name", typeof(string));
            dt.Columns.Add("Category", typeof(string));
            dt.Columns.Add("Price", typeof(decimal));

            dt.PrimaryKey = new DataColumn[] { dt.Columns["ID"] };

            Session[DataTableSessionKey] = dt;
        }

        return dt;
    }
}
protected void RadGrid1_NeedDataSource(object sender, GridNeedDataSourceEventArgs e)
{
    (sender as RadGrid).DataSource = SessionDataSource;
}

protected void RadGrid1_InsertCommand(object sender, GridCommandEventArgs e)
{
    GridEditableItem insertItem = (GridEditableItem) e.Item;

    Hashtable newValues = new Hashtable();

    insertItem.ExtractValues(newValues);

    DataRow findLastItem = SessionDataSource.Select("ID=MAX(ID)").FirstOrDefault();

    newValues["ID"] = findLastItem != null ? (int) findLastItem["ID"] + 1 : 0;

    DataRow rowToInsert = SessionDataSource.NewRow();

    foreach (DictionaryEntry entry in newValues)
    {
        rowToInsert[entry.Key.ToString()] = entry.Value ?? DBNull.Value;
    }

    SessionDataSource.Rows.Add(rowToInsert);
}

When the JAWS screen reader is used alongside the Grid with enabled keyboard navigation, using Alt + Up/Down arrow doesn't work as intended, most noticeably trying to use Alt + UpArrow doesn't move the focus to the previous row. 

This behavior can be observer on the Keyboard navigation demo as well

For RadGrid, after setting EnableKeyboardShortcuts to false, I find the Up/Down keys are also disabled. However, according to your online document below, the Up/Down keys shouldn't be disabled in this case.

According the Keyboard Support online demo, these buttons should not get disabled:

"The grid also features an additional property ClientSettings -> KeyboardNavigationSettings -> EnableKeyboardShortcuts which when set to false will disable all keyboard navigation shortcuts except for the Up/Down and Page Up/Page Down keys."

.hasChanges() results in records flagged for Delete to not actually get deleted when .saveChanges() executes.

I found the same behaviour on a LiveDemo example that checks .hasChanges(): Grid - Binding to Telerik ClientDataSource

Steps to reproduce:

• Make any change to the first record, such as modifying the Contact Name.
• On the second record, Click the "x" under the DELETE column to mark it for delete.
• Click any column heading to sort.  (This calls a UserAction event handler that calls .hasChanges())
• Choose to Cancel at the popup prompt.
• Click "Save changes".
• Monitor the browser console, you will find that webservice UpdateCustomers is called,  but DeleteCustomers is not.

It would be good to add this functionality for a better customization of the Grid's newly inserted rows.

When I try to set the Skin to Material I obtain the following Error:

WebResource.axd?d=e4b2sCc8Q8M6A2MgSsDltOpyL908K1Q7T29bPdSz7Supj8wwNwBiCRISuCJlWYcTaJsmG21ZOfynS4jGurXXbpli-ERqUAuqN0-JIBovYD49aTvhGO3Rn_RCmsSdUlmwuseC48k3n557KQEGgkr2hCHOsY41&t=638423073240000000] DETAILS: System.Web Exception: msg:Richiesta webresource non valida.

The problem happens when the ButtonType="ImageButton" is set with the Material skin:

<telerik:GridEditCommandColumn ButtonType="ImageButton" HeaderStyle-Width="20px" >
</telerik:GridEditCommandColumn>
<telerik:GridButtonColumn ButtonType="ImageButton" UniqueName="DeleteColumn" Text="Elimina" HeaderStyle-Width="20px" CommandName="Delete" ConfirmText="Procedere con la cancellazione del Cimitero?"></telerik:GridButtonColumn>

Found an additional issue when implementing this on a project:

When aria-enabled=true and we follow their instructions if we have a gridnumericcolumn in the grid, then we get a finding that "Elements must only use supported ARIA attributes" because To solve this problem, you need to fix the following:

ASPX

                <telerik:RadGrid ID="RadGrid1" runat="server" AutoGenerateColumns="False" AllowFilteringByColumn="true" OnNeedDataSource="RadGrid1_NeedDataSource" EnableAriaSupport="true">
                    <ClientSettings>
                        <ClientEvents OnGridCreated="OnGridCreated" />
                    </ClientSettings>
                    <MasterTableView>
                        <Columns>
                            <telerik:GridBoundColumn DataField="ID" HeaderText="ID" UniqueName="ID" />
                            <telerik:GridBoundColumn DataField="Name" HeaderText="Name" UniqueName="Name" />
                            <telerik:GridCheckBoxColumn DataField="IsActive" HeaderText="Active" UniqueName="IsActive" />
                            <telerik:GridNumericColumn DataField="Score" HeaderText="Score" UniqueName="Score" DataType="System.Int32" DataFormatString="{0:N0}" />
                        </Columns>
                    </MasterTableView>
                </telerik:RadGrid>

ASPX.CS

    protected void RadGrid1_NeedDataSource(object sender, GridNeedDataSourceEventArgs e)
    {
        // Creating a dummy data source
        var data = new List<DummyData>
        {
            new DummyData { ID = 1, Name = "John Doe", IsActive = true, Score = 88 },
            new DummyData { ID = 2, Name = "Jane Doe", IsActive = false, Score = 92 }
        };

        RadGrid1.DataSource = data;
    }

    public class DummyData
    {
        public int ID { get; set; }
        public string Name { get; set; }
        public bool IsActive { get; set; }
        public int Score { get; set; }    
    }

When the AriaSupport for the Grid is turned on, an aria-label is added to each column header automatically using the UniqueName of the column. The problem is - UniqueName doesn't support empty spaces - all "labels" must be single words or use Underscores - and the screen readers say "underscore."

So my column of "call_date" results in "Call underscore Date" - which is not useful for visually impaired people.

The submenu with filtering options has elements that overflow the sliding element:

When EnablePostBackOnRowClick="true" and clicking on the RadAutoCompleteBox inside the EditItemTemplate the Grid will make a PostBack.

This issue does not happen with other elements (span, input, button, etc).

ResizeGridOnColumnResize is not working the same way when Grid has StaticHeaders.

I want to resize the grid based on the contents and still be able to scroll with headers.

When scroll inside RadGrid in Chrome on a mobile device or in the DevTools responsive/mobile mode, the browser throws [Intervention] Unable to preventDefault inside passive event listener due to target being treated as passive. See  https://www.chromestatus.com/features/5093566007214080. I get 1 error message for every pixel the grid scrolls. 

The problem is due to jQuery and is reproducible with 1.12.4 and 3.3.1 versions of it.

Applying styles to the rows when exporting to PDF causes the Grid to duplicate the column headers at page breaks.