We're noticing issues related to grid load. We're observing the flickering of the data grid on launch.

In some cases, the grid would stay blank and won't recover until the window is resized (which would trigger repainting of the grid).

The behavior occurs with 11.0.0 version and above. With 10.1.0 no issues.

When setting GroupAggregatesAlignment NextToHeader and the column size mode is stretch or auto, the aggregates text in the group header is misaligned, part of the text enters in next column when data changes.

When the control is scrolled, some cell is edited or some other operation is applied, the text is displayed as expected.

A NullReferenceException is thrown during the measure phase of a DataGridTextColumn when a CellRenderer is applied:

Some data is missing from the UI when grouping is applied and then filter the data. 

If you ungroup, the items are displayed.

Starting with v10, all groups except the last, get a blank, empty row.

If you toggle off the grouping, the empty rows go away, but once you put the grouping on, these empty rows show up again.

Keep the data grouped, make the window a bit smaller so you have a decent amount of rows to scroll through, and using your mouse wheel, scroll up and down quickly. Eventually you'll notice that the grid will start to bounce a bit. For example, you'll scroll down and then without scrolling the mouse wheel up at all, it'll jump back up a few rows on its own.

Begin editing the first cell firs column
Without closing the cell editor, scroll down to the last cell, the first cell should exit the viewport.
Start editing the last cell.
Scroll back up to the first cell

The content inside the first cell is missing.

The content should be there.

When a ComboBox editor is open in the DataGrid, one can use the arrow keys to go up and down the items of the combo in order to make a selection. When pressing Enter it is expected that the ComboBox gets closed and the DataGrid is still in edit mode for the same cell.

However, when the Enter is pressed - the ComboBox closes and the next row goes into edit mode - this behavior is erroneous.

when applying Grouping and RowHeight to the DataGrid and expand the row details, the following happens -> The DataGrid in the RowDetails only appears for alternate rows. 

In addition the RowHeight does not apply to the Grouping Row.

Workaround:

Remove the RowHeight from the DataGrid and set the CellContentStyle property to the columns and set the TextMargin to the DataGridTextCellStyle, and ButtonMargin to the DataGridToggleRowDetailsCellStyle. Here is an example when setting them to 0:

            <telerik:DataGridTextCellStyle x:Key="cellStyle"
                                           TextMargin="0"/>


            <telerik:DataGridToggleRowDetailsCellStyle x:Key="toggleStyle"
                                                       ButtonMargin="0"/>


            <telerik:RadDataGrid.Columns>
                <telerik:DataGridToggleRowDetailsColumn CellContentStyle="{StaticResource toggleStyle}"
                                                        IsFrozen="True"/>
                
                <telerik:DataGridTextColumn PropertyName="Country"
                                            CellContentStyle="{StaticResource cellStyle}"
                                            IsFrozen="True" 
                                            CanUserReorder="False"  />
                
                <telerik:DataGridTextColumn PropertyName="Capital" 
                                            CellContentStyle="{StaticResource cellStyle}" />
            </telerik:RadDataGrid.Columns>