On start up a Binding error is thrown in the Output for ElementName=WatermarkTextBox.

Available in LIB version 2016.3.1017, it will be also available in the 2016 R3 SP1 release. 

When the Populate method is called from the control's GotFocus or PreviewMouseLeftButtonDown events, moving the parent Window does not close it's DropDown.

Available in LIB Version 2016.3.1010, it will be also available in the 2016 R3 SP1.

Should be clicked somewhere else afterwards in order to refresh the cursor.
The fix is available in R2 2016 SP1.

If there is only one item left in the drop down or it is the first item, when it is clicked with the mouse the events are raised. 

Exposed the HandleKeyDown method of RadAutoCompleteBox. In order to navigate to the next control when Tab key is pressed, the method should be overridden as shown below:

public class CustomAutoCompleteBox : RadAutoCompleteBox
{
protected override bool HandleKeyDown(Key systemKey)
{
return base.HandleKeyDown(systemKey) && systemKey != Key.Tab;
}
} 
Available in LIB version 2016.2.525, it will be also available in the 2016 R2 SP1 release.

When you set TabIndex property the control still uses the default value.

Available in LIB version 2016.1.314, it will be also available in the 2016 Q2 Release.

After removing an item with it's remove "X" button, two mouse clicks are required in order to lose the focus from the control.

Available in LIB version 2016.2.606, it will be also available in the 2016 R2 SP1 release.

This causes strange behavior where if the control is unloaded and that loaded again the "Text" in the control's TextBox is returned to the cleared item's text.

Available in LIB version 2016.2.530, it will be also available in the 2016 R2 SP1.

Available in LIB version 2016.2.525, it will be also available in the 2016 R2 SP1 release.

1. RadAutoCompleteBox with an ObservableCollection set to its ItemsSource

2. The ObservableCollection is populated on the server side once the SearchText of the control changes.

3. The drop down part of the control closes itself even If there are filtered items.

No items are returned by the AsyncFilteringBehavior if the ItemsSource contains objects of a nested class.
For example the ItemsSource is bound to a "List<Item>" collection and the "Item" class is declared inside a different class (nested classes).

Available in LIB version 2016.1.208, it will be also available in the 2016 Q1 SP1 Release.

AutoCompleteBox cannot be focused on the page load.

If the SelectedItem is initially bound to an object and Tab focus passed through the control the text in it disappears.

The filtering mechanism is not triggered if the drop down of the control is opened and its ItemsSource is changed 

HighlightedIndex is lost when the drop down is opened and the ItemsSource is replaced.

Initially the events is triggered correctly and after switching between TabItems the event is not longer triggered. 

The issue also is reproducible inside RadDocking control.

The control is focused after the SelectionChanged event is triggered when selection is made with the mouse