When a column is bound to a nullable Enum and the null value is selected in the field filter RadComboBox, when the popup is reopened this value is cleared from the UI even though the filtering remains unchanged.

The aggregate values shown in the group headers are wrong when scrolling. This happens when the EnableColumnVirtualization property is set to False and ColumnAggregatesAlignment is NextToGroupKey or BelowGroupKey.

To work this around, set the EnableColumnVirtualization property to True or ColumnAggregatesAlignment to NoAlignment. 

When the GridViewComboBoxColumn's DataMemberBinding is bound to a property, which is not a primitive type, selecting an item from the drop-down causes the first item of the ItemsSource to be displayed, rather than the selected one.

See this thread for more info:
http://www.telerik.com/forums/alternaterowbackground-doesn't-merged-with-rowstyle

It's  really common scenario, because a standard WPF DataGrid works like this.

Add a mechanism to fix the current viewport (scrollbar position) when new items are inserted. Currently, when you insert items before the viewport's start, the scrollbar position is offset.

RadGridView provides two methods to bring an item into the view. We could extend these or create a new one to bring an item to a specific position.

Currently, you can set the data format string of the cells in a GridView column by using the DataFormatString property of the column.

Add a mechanism to select the DataFormatString per cell. For example, this can be done using the CellStyleSelector and a new property in the GridViewCell. Or by introducing DataFormatStringSelector property.

The following exception is thrown when selecting the IsNull operator and the column is bound to a nullable Enum:

"ArgumentException: Must specify valid information for parsing in the string."

The exception is handled internally but results in the filtering not being applied.

An empty are before the row appears when you collapse its row details. This happens if the GroupRenderMode is set to Flat and the control is hosted in a RadExpander control. To recreate this, the RadGridView also should have its scrollbars displayed and a RowHeight set to a value bigger then 30 (ex: 35). Note that the row height may increase also if the height of the content in the row is bigger. 
Additionally, to reproduce this, the content of the row details should exceed the viewport.

To work this around, you can set the GroupRenderMode to the legacy Nested layout. Alternatively, you can use the native Expander control instead of RadExpander. Or you can ensure that the contents in the row is less then 35.

Currently, when access to the SearchViewModel is needed, it can be achieved through the Loaded event of the RadGridView and Telerik's ChildrenOfType extension to first find the respective GridViewSearchPanel and then its DataContext which is of type SearchViewModel.

SearchStateManager property is null when trying to change any of the properties of the SearchStateManager object in the Loaded event. This behavior is observed when the ShowSearchPanel property is not set to true initially.

Can be observed in FirstLook demo of the RadGridView.
While resizing the demos window, radgridview's horizontal scrollbar might flicker when demos viewport size is close to the gridview size.

Hi Telerik,

I have created a sample project for an issue I have found:

Please see the code behind of the sample.

When removing a column from a grid where the display index was changed, and rows are selected, I do get an ArgumentOutOfRangeException. 

Any help is appreciated!

Thank you!

Thomas

When adding distinct values with a delay after the DistinctValuesLoading event, the RadGridView is not filtered correctly when they are checked.

Column widths are not calculated correctly when star-width columns are added dynamically which leads to the appearance of a horizontal scrollbar when it is not required.

If you add a column with IsReorderable set to False and then drop another column over it, nothing should happen. However, sometimes the drop is executed and the not reorderable column is moved to another index.

To work this around, cancel the reordering in the ColumnReordering event if the drop target column cannot be reordered.

Currently, when you click F2 or double mouse click in order to start editing a cell (with a TextBox editor) its text gets selected. This happens because the SelectAll() method of the underlying TextBox is called. Add a property that allows to disable this behavior and to avoid selecting the text.

At this point you can get this effect by creating a custom column and overriding its PrepareCellForEdit() method as shown here: https://docs.telerik.com/devtools/wpf/knowledge-base/kb-gridview-prevent-f2-text-selection 

Currently, the Control Panel button is placed in the same row like the group panel. This means that if you hide the group panel, but keep the Control Panel button, then you will end up with a single button an a considerable empty area on top of the GridView. This is noticeable mostly when you also display also the search panel. 

Add a property that allows you to move the position of the Control Panel button from the group panel's Grid row to the search panel's row. This way you can make the GridView more compact by placing the button in the search panel's area.

We are using telerik:RadGridView.RowDetailsTemplate in our GridView and we need the ability to expand or contract all rows at the press of a button.  As in the demo code under Hierarchy, we need to do this from our ViewModel.  Can the IsExpandedBinding be implemented for this use case in addition to when using hierarchical data?