The workaround is to set String.Empty for TextSearchPath before setting the new value for the DisplayMemberPath

Similar to BoxesItemTemplate when SelectionMode=Multiple.
Perhaps switch between modes of text entry and SelectedItemTemplate. This would allow a custom display of the selected item and the ability to re-enter search by text mode. It might be nice if the type search text stayed so if you mis select- simply clicking the search text would get the user back to the same filtered list pre-mis-select.

Steps to reproduce:
1. Run the attached sample application 
2. Enter the value that is not on the list of autocomplete values.
3. The RadAutoCompleteBoxAutomationPeer.Value return null, because the value is not included in SelectedItems collection

If the entered value is included in the list, the RadAutoCompleteBoxAutomationPeer.Value contains a comma (',') in single selection mode.

Workaround: 
1. The first approach is getting the value from nested watermark text box 
2. Another approach is creating own AutomatomationPeer that getting the value from SearchText 

The current workaround is to directly set the value of the underlying TextBox instead:

this.RadAutoCompleteBox.ChildrenOfType<TextBox>().First().Text = "1 I";

When you start typing, the dropdown appears and then you leave the AutoCompleteBox without clicking, the cursor is not changing back to arrow.

As a workaround of the issue you could manually release the mouse capture in the Populated event handler of the control as shown below:


 private void AutoCompleteBox_Populated(object sender, System.EventArgs e)
        {
            if (Mouse.Captured is RadAutoCompleteBox)
            {
                (sender as RadAutoCompleteBox).ReleaseMouseCapture();
            }
        }

If you have RadAutoCompleteBox above RadPanelBarItems and the expanded drop down menu (of the RadAutoCompleteBox) covers them, if you click over some of the drop down items the RadPanelBarItem below gets clicked too.
The fix is available in  Q2 2013 Release.

Available in LIB version 2017.1.213 , it will be also available in the R1 2017 SP1 Release.

In Multiple SelectionMode it would be useful to be able to customize the way selected items (boxes) are displayed. Customizing their looks via a StyleSelector would be optimal.

Make it possible to customize the built-in AsyncFilteringBehavior by inheriting it or it's interface

e.g. AutoCompleteBox is in SelectionMode="Single" has 3 items - "Item 1", "Item 2", "Item 3"When the user enters "Item 1" with keyboard, the control should select this item.

Clicking the ScrollViewer of the control causes the focus to be retained by the RadAutoCompleteBox, leading to double mouse click required in order to access outside control.

Also the mouse cursor is changed IBeam value rather than the default Arrow value.

The fix is available in the 2016 R3 SP1 release.

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

When the SelectedItems property is bound, moving items inside that collection causes ArgumentException.

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

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.