1. Load the ControlDefault theme in Visual Style Builder
2. Edit the cell style and try to disable the cell border when RadGridView is not focused and the HideSelection property is set to true.
3. You cannot because the HotTracking property is not updated correctly for grid cells.

Workaround: 
void radGridView1_CellFormatting(object sender, CellFormattingEventArgs e)
{
    if (e.CellElement.IsCurrent && !e.CellElement.RowElement.HotTracking)
    {
        e.CellElement.DrawBorder = false;
        e.CellElement.DrawFill = false;
    }
    else
    {
        e.CellElement.ResetValue(LightVisualElement.DrawFillProperty, ValueResetFlags.Local);
        e.CellElement.ResetValue(LightVisualElement.DrawBorderProperty, ValueResetFlags.Local);
    }
}

You should be able to bind GridViewColorColumn to a text column.

1. Create a new project and setup hierarchy
2. Add a large number of rows as child rows to the last row at first level
3. Run the project and try to expand the last row

Currently there is SortDirectionArrowPrimitive allowing you to set an arrow for both states, but this way you cannot use custom image for the different sort operations.

The GridViewBrowseColumn's editor could have two modes - OpenFileDialog and FolderBrowserDialog.

There is a bug regarding the filtering of the grid, in the GridViewComboBoxColumn.
The filtering result displays wrong value.  
The bug accurse when:
   - Select a value form a GridViewComboBoxColumn.
   - Clear Filtering of the grid.
   - write a new value in the filtering GridViewComboBoxColumn cell, before living the cell.
The grid is filtered with the previous selected value.  
Note: the bug accurse only when the ReadOnly Property of column is off.

Allow hiding of whole group in ColumGroupsViewDefinition by adding Visibility property to ColumnGroup class.

The horizontal scrollbar of the control does not behave correctly when there are several pinned columns and their width is larger than the visible area of RadGridView.

ADD. RadGridView - add support for sorting GridViewComboBoxColumn by Display or Value member in unbound mode.

When you select the cells of a pinned column and this column overlaps the next column, the cells from the next column are selected too.

There are 2 main problems in this functionality:
A) User has to click the filter check box twice to get the state changed for the first time. That is unacceptable, It must work from first click from first click check box must change its state.
B) Parameters of FilterChanging event are absolutely useless and what is worse they even lie about real state of the filter.
C) If I want to edit in column editor FilterDescriptor property of the column some maybe old dialog window appears because whatever I set here it does not change anything.

Currently RadGridView supports only copy & paste between grid cells

The ValueChanged event of RadGridView is fired when the RadDateTimeEdior has null value and the popup is opened.

Exception occures when you have applied excel-like filtering and load layout.

The Column Chooser of RadGridView should show the invisible columns sorted.

The evaluation of invalid expressions in RadGridView should not crash the host application.

use attached project with pre-build release version of assemblies included in the 'telerik-devbranch-release' folder
1. Create a new project with RadGridView and bind it to a data source. The data source should contain a large number of rows (30000 for example)
2. Add a check box column
3. Run the project
4. Sort by a column (different from the checkbox column)
5. Check a checkbox
6. Click on some other column or row

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

GridSpinEditor should round its value on end edit considering the number of decimal places.

Incorrect RadGridView behavior when changing sorted GridViewCheckBoxColumn checkboxes states.