Improve RadGridViewDragDropService extensibility to perform visual drop indication over RadTreeView.

This way, one will be able to make sure that the expression is valid prior assigning it to the column

IMPROVE. RadExpressionEditorForm - add ability to be shown as modal form

There should be a way to determine if the row was deleted through the cell or row header context menu or by pressing the delete key.

In particular customers want to add a button showing the excel like filter popup.

The Expression Editor should be able to make expressions for a column in the parent template getting data from the child views.

ADD. RadGridView should support binding to IQuerable

We also have another grid (the Microsoft one) and in that one for resizing a vertical line is drawn to indicate the size of your column. Only when you release the mouse is the column actually resized. I think this is better for the performance of the grid. In the attachment you can see what I mean.

ADD. RadGridView - add support for self-reference hierarchy for child levels as well

Make possible users easily to change the behavior of replacing the null value with empty string.

Workaround: 
DataTable table = new DataTable("table");
table.Columns.Add("ID", typeof(int));
DataColumn col = table.Columns.Add("Name", typeof(string));
col.AllowDBNull = false;
col.DefaultValue = string.Empty;
table.ColumnChanging += new DataColumnChangeEventHandler(table_ColumnChanging);
this.radGridView1.DataSource = table;

private void table_ColumnChanging(object sender, DataColumnChangeEventArgs e)
{
    if (!e.Column.AllowDBNull && (e.ProposedValue == DBNull.Value || e.ProposedValue == null) && e.Column.DataType == typeof(string))
    {
        e.ProposedValue = string.Empty;
    }
}

Consider the iTunes Artist mode grid
http://www.telerik.com/forums/itunes-like-grid

Allow setting the CurrentColumn/CurrentCell in the RowValidaging event

IMPROVE. RadGridView - In hierarchy the excel-like filtering on child levels to show values only from the rows of the expanded row instead of all rows of the template.

Depending on when the ViewDefinition is applied RadGridView throws an exception or not

Improve the user experience by adding marker which shows the position where the group element will be added.

Currently it is not possible to hide the horizontal scrollbar of child views in RadGridView and to use a single root level scrollbar.

The total summary rows have the same number of indent columns as the group summary rows and it makes them harder to distinguish.

Currently when using RadGridView in AutoSizeRows mode, only the cells that are visible determine the row height.

Currently it is possible to localize only menu names that appear in expression editor list, not in the expression itself.

The user should be able to select just part of the text in read-only grid using mouse.