Available in LIB version 2017.1.213 , it will be also available in the R1 2017 SP1 Release.

InvalidOperationException, when sorting or filtering GridView and an observable immutable collection is used in a multithread application.

Not all of the FilteringControl elements have automation IDs. This fact prevents the proper usage of some automation frameworks.

DataFormatString is not respected when exporting RadGridView to .xlsx file and a GridViewDataColumn is bound to a nested property.

Available in LIB version: 2017.2.605

Available in LIB version 2016.3.1128, it will be also available in the 2017 R1 Release.

Available in the 2017 R1 release (2017.1.117).

Sample:
<telerik:RadGridView ShowSearchPanel="true" ShowSearchPanelCloseButton="false"
or
<telerik:RadGridView ShowSearchPanel="true" ShowSearchPanelCloseButton="Hidden"

Workaround: reused the cell element like this:
CreateCellElement(Telerik.Windows.Controls.GridView.GridViewCell cell, object dataItem)
{
    var button = cell.Content as Button;
    . . .
 
    return button;
}