Limit selection when DateSelectionMode="Month"

Environment

Product

RadDateTimePicker for WPF

Description

How to limit selection when the DateSelectionMode property is Month.

Solution

Create a custom StyleSelector and disable the months by setting the IsEnabled property of the CalendarButtonContent. After that, set the StyleSelector to the MonthButtonStyleSelector property of the RadDateTimePicker.

C#

    public class MonthSelector : StyleSelector
    {
        public override Style SelectStyle(object item, DependencyObject container)
        {
            CalendarButtonContent content = item as CalendarButtonContent;
            if (content != null)
            {
                var monthsToEnable = new List<string>() { "Mar", "Jun", "Sep", "Dec" };
                if (!monthsToEnable.Contains(content.Text))
                {
                    content.IsEnabled = false;
                }
            }
            return base.SelectStyle(item, container);
        }       
    }

XAML

    <Grid>
        <Grid.Resources>
            <local:MonthSelector x:Key="monthSelector"/>
        </Grid.Resources>
        <telerik:RadCalendar DateSelectionMode="Month"
                             MonthButtonStyle="{x:Null}"
                             MonthButtonStyleSelector="{StaticResource monthSelector}"/>
    </Grid>