I wanted to give you an update as I was able to come up with a fix for this issue. Below is the code that actually disabled the Fade Animations:
For the Multi-Column Combo Box:
radMultiColumnComboBox1.MultiColumnComboBoxElement.MultiColumnPopupForm.FadeAnimationType = FadeAnimationType.None;
For the Date Time Picker:
RadDateTimePickerCalendar calendarBehavior = radDateTimePicker1.DateTimePickerElement.GetCurrentBehavior()
calendarBehavior.PopupControl.FadeAnimationType = FadeAnimationType.None;
I wanted to thank you for getting me pointed in the right direction so I was able to figure out this issue. That being said there are a few things I have noticed during this process.
First, I set these properties in the Element Hierarchy Editor at design time and there was no effect when I compiled and ran the code. That seems to be a serious bug with these controls because if I set these properties at design time using your Element Hierarchy Editor that should be the same as adding the code to the page load event. This was not the case and added to the confusion of the issue.
Second, you guys should really revisit how you handle the animations in these controls. At first I was told to use "ThemeResolutionService.AllowAnimations = false" to disable all control animations but then was told that it would not effect the popup menu's in the controls. The setting to disable those animations as you instructed then did not work as I was told it would. I had to then look further into your control logic to find the FadeAnimationType property and figure out that it needed to be set to None in page load code for the animations to finally be turned off.
All of these issues with the Animations seems to be more complicated and confusing for the end user than it needs to and as a result all of us needed to take extra time to figure these issues out. If "ThemeResolutionService.AllowAnimations = false" actually overrided all other animation settings in the controls then that would be a much better solution.
So far overall I like the Telerik controls but I hope you consider something along this line so others don't have as much trouble as I did in the future.