Currently, we offer Predictive Text Search for the majority of our Properties.
However, the ImageBrush Panel does not offer this functionality, and the user is able to type into the offered ComboBoxes to filter, and jump to their desired value.

Repro Steps:

1) Prepare a Studio Project Directory featuring a selection of Images of your choice.

2) In the directory created in Step 1), create a Studio Project featuring a MainPage.xaml.

3) Introduce an Image Element to the root of the MainPage, select it, identify its 'Source' Property, and click on its value selector ComboBox.

4) With the Image's 'Source' Property ComboBox open, start typing letters in any of the Image assets part of the Project that were prepared in Step 1).
Observe how the ComboBox's results filter to the input text.

5) Introduce a Border Element to the root off MainPage, select it, identify its 'Background' Property, and click on the value field to open its Brush Selector popout module.

6) Within the Brush Selector, navigate to the 'Image Brush' tab, then click on the 'ImageSource' Property ComboBox.

7) With the ImageSource ComboBox open, begin typing letters as performed in Step 4).
Observe how no Predictive Search feature is offered as it was when selecting a 'Source' for an Image Element.

8) Select an Image from the list manually by clicking on one.

8) Still with the ImageBrush panel open, click on the 'Stretch' Property ComboBox to open it, then begin typing to filter down the list of options.
Observe how no Predictive Search functionality is offered.

Expected Results: All compatible Properties of the Brush Panel offer Predictive Search functionality