To reproduce: 

Change the scaling to 200% or larger.

Set the animation:

 this.commandBarToggleButton1.UseDefaultDisabledPaint = true;
 this.commandBarToggleButton1.Enabled = false;

• .net 4.7.2

      

•  .net8.0

      

 

To reproduce the issue:
1. Add a RadDateTimePicker control to a Windows Forms application.
2. Use the "ar-SA" culture.
3. Attempt to manually enter a date in the RadDateTimePicker control using letters or special characters.

The calendar drop-down is displayed incorrectly the first time. If I close and reopen it, it shows the entire calendar and everything is well.

Add support for UI Automation in RadDateTimePicker control.

Applications hangs when using custom format containing one part ("ddd" or "dddd"). 

Here is how it looks at 200 % DPI:

In this particular case, we are using the SetToNullValue() method. To reproduce this behavior we can type a valid date in the editor area. Press the tab key to move the focus out of the control. Call the SetToNullValue() method which will set the Value property to null. Focus again on the control and type the same date again. When we tab out of the control, the date is valid and will be shown in the editor area. However, the Value property remains empty.

In this scenario, the FreeFormDateTime mask type is used and the ShowCheckBox property is set to true. When the user clears the date and start type and in the process of entering the date, press Left or Right key arrows, the CheckBox inside is focused which triggers the validation of the control.