DatePicker and EditMask controls
The CalendarBackColor property defines the color to be used for the background of the calendar that displays when you click on the down arrow in a DatePicker control or an EditMask control with the DropDownCalendar property set to true. When you are defining the background color in a painter, some of the choices take their values from the current Windows color scheme or from custom colors. To add your own colors to the color drop-down list, select Design>Custom Colors before displaying the Properties view.
This property does not work on the Microsoft Vista operating system.
To set the background color for the calendar in a DatePicker or EditMask control:
Select a color from the BackColor drop-down list on the Calendar page in the control’s Properties view.
The CalendarBackColor property takes a long (-2 to 16,777,215) that specifies the numerical value of the background color . The CalendarBackColor value is a combination of values for the red, green, and blue components of the color.
If you do not know the long value for the color, choose Design>Custom Colors to determine the red, green, and blue values and then call the RGB function to specify the color in a script.
The following example sets yellow as the background color for the calendar in a DatePicker control:
dp_1.CalendarBackColor = RGB(255, 255, 0)