If you have your grid bound to a table with a single string column, changing the DataType of the resulted column in RadGridView to int, should change the way the column is sorted.

Implement "Tag" and "Name" properties into the GridViewColumnGroup.

1. Create a new project with RadGridView.
2. Bind it to a data source with two columns and make the first one read only.
3. Handle the CellValidating event and add a condition to validate the second column.
4. Run the project and enter invalid value in second column.
5. Now enter a correct value and press Tab key. You will be navigated to a wrong row.

If the Average aggregate is applied over a column which contains only integer data (for example over the ID column of a DataTable), the result will be calculated as an integer value which is not correct in most cases. To workaround the issue, add a custom evaluation of the average function on the GroupSummaryEvaluate event:

        void radGridView1_GroupSummaryEvaluate(object sender, GroupSummaryEvaluationEventArgs e)
        {
            if (e.SummaryItem.FieldName == "ID" && e.SummaryItem.Aggregate == GridAggregateFunction.Avg)
            {
                int count = 0;
                decimal sum = 0;
                foreach (GridViewRowInfo row in this.radGridView1.Rows)
                {
                    count++;
                    sum += (decimal)row.Cells["ID"].Value;
                }

                e.Value = count > 0 ? sum / count : 0;
            }
        }

If one exports a hierarchy and a hierarchy row does not have child rows, the header cells of the row's child view are still exported.

1. Create a new project with RadGridView.
2. Set AutoSizeRows to true and WrapText in one of the columns to true.
3. Set the ApplicationThemeName to Aqua.
4. Set EnableFiltering to true.
5. Run the application and filter by the first column, the filtering row resizes correctly. Now filter the column where WrapText is set to true. It will not resize correctly.

NullReferenceException is thrown, when the following steps are performed:

1. Scroll horizontally
2. Move a column by mouse drag and drop.
3. Start writing in the filter cell of the moved column
4. Suddenly the editor is closed.
5. When you try to write in the filter cell again, exception is thrown.

Work around:

void radGridView1_EditorRequired(object sender, Telerik.WinControls.UI.EditorRequiredEventArgs e)
{
    if (e.EditorType == typeof(RadTextBoxEditor))
    {
        e.Editor = new RadTextBoxEditor();
    }
}

Advanced Property Grid in Property Builder filter the data source list and not show 'Project Data Sources' for selection in the DataSource popup.

There is a difference in the drop down Datasource selection between the :
    GridviewDataColumn Collection Editor      and the...
    RadGridView Property Builder

1. If one enters edit mode by pressing F2, clicks to enter edit mode or comes from another cell in edit mode - the value in the cell that enters edit mode is selected and any user input removes the old value.
2. If one enters edit mode by directly hitting a numeric key the value in the cell is set to that numeric value, a decimal separator and a number of trailing zeros equal to the editor decimal places.
Example:
Let a cell value be 1.23
If one wants to input 4.56 (s)he will have to press 4 then select the trailing zeros and press 5 and 6.

has no user validation, exception when the type of parent and child keys is different

The active text box editor overlaps the bottom cell border, when RadGridView uses Windows 7 Theme.

The Active editor is not focused when the CellValidating event is canceled and navigation is performed.

Workaround: use the CellEndEdit event to work around the navigation issue: 

private void CellEndEdit(object sender, GridViewCellEventArgs e)
{
    this.grid.CurrentRow = null;
    this.grid.CurrentRow = e.Row;
}

Currently sub-property binding is supported in the MasterTemplate of the grid (level 1). We should make this functionality available in lower levels when users are creating an object relational hierarchy.

1.Pressing left while the first cell in the gird is current, should not cycle the cells- do nothing
2. Pressing right while the last cell of the last row is current, should not cycle the cells - do nothing

1. Create a new project in VB.
2. Add a form containing TabControl with two pages. On the first page add some editor controls and on the second dock RadGridView control.
3. Bind the grid with a data source.
4. Make the first page visible.
5. Make both source code and designer visible.
6. Click debug from the toolbar.
7, Close the application.

Implement a property such as EncloseDataWithQuotes, which should get or set whether the exported data should contain quotes 
http://www.telerik.com/help/aspnet-ajax/p_telerik_web_ui_gridcsvsettings_enclosedatawithquotes.html

1. Create a new project with RadGridView and setup grouping.
2. Run the project, expand several groups and start navigating with left / right keys.
3. You will see that when navigating through group rows, RadGridView iterates all columns. It should select the next/previous row with a single click.

Self-referencing hierarchy does not occur, if you bind the grid inside BeginUpdate-EndUpdate method invocation.

On the form load, the grid is loaded with three parts. Upon refresh, the buttons call a method which generates the same data table but with some additional parts - to simulate a data refresh.

Button 1 - Refresh Data
- This button calls a method that operates the same as detailed initially in the ticket; it utilizes the BeginUpdate/EndUpdate methods around the updating of the grid. This replicates the scenario I initially described where message boxes are fired stating "Column 'xxx' does not belong to table 'fileSystem'.".

Button 2 - Refresh Data 2
- This button calls a method that is modified as suggested - the BeginUpdate/EndUpdate methods have been removed and the DataSource is set directly.

Button 3 - Clear Data
- This button is meant to simply clear the data from the grid. It only attempts to set the DataSource property to Nothing.