If you open a label filter dialog from the RadPivotFieldList control for a DateTime field and choose the "is between" or "is not between" operator from the combobox, you will notice that the RadDateTimePicker controls used to filter the dates very small. In this case, the empty value placeholder is clipped and if you choose any dates they are clipped too.

To work this around, you can increase the dialog's width when it opens. You can do this with the RoutedDialogEvents.RequestDialog event.

public MainWindow()
{
	InitializeComponent();
	pivotFieldList.AddHandler(RoutedDialogEvents.RequestDialog, new EventHandler<DialogHostingRequestEventArgs>(this.OnDialogHostRequested), true);
}

private void OnDialogHostRequested(object sender, DialogHostingRequestEventArgs e)
{
	var labelDialog = e.DialogInfo.Content as LabelFilterDialog;
	if (labelDialog != null)
	{
		var w = labelDialog.ParentOfType<RadWindow>();
		w.Width = 500;
	}
} 

Currently, you can use the FilterDescriptions of the Olap data providers (like AdomdDataProvider and XamlDataProvider) or the GroupFilter of the group descriptions. 

Add an API that allows you to implement custom filtering behavior using a filtering function or constructing custom filtering expression.

Currently, the Telerik.Pivot.DataProviders.Adomd project relies on that the Microsoft.AnalysisServices.AdomdClient dll is installed in the GAC. The dll is installed with the ADOMD feature package that come with the SQL Server installation. If the required SQL Server feature is not installed on the machine, the Microsoft.AnalysisServices.AdomdClient.dll is missing from the GAC and the installation of the Telerik.Pivot.DataProviders.Adomd.for.Wpf package fails with an error. The error is:

Failed to add reference. The package 'Telerik.Pivot.DataProviders.Adomd.for.Wpf.Xaml' tried to add a framework reference to 'Microsoft.AnalysisServices.AdomdClient' which was not found in the GAC. This is possibly a bug in the package. Please contact the package owners for assistance.

Add a dependency to the Microsoft.AnalysisServices.AdomdClient package, instead of relying on the dll installed in the GAC.