private void showBrowser() {
		CategoryPath path = dataTypeManagerService.getCategoryPath(initiallySelectedTreePath);
		if (path != null) {
			setCellEditorValue(path);
			selectionField.requestFocus();
		}
	}
Returns the direction of the user triggered navigation; null if the user did not trigger
navigation out of this component.
@return the direction
Ghidra/Features/Base/src/main/java/ghidra/app/util/datatype/CategoryPathSelectionEditor.java