Update components/panelbar/data-binding/overview.md

Author: ntacheva

components/panelbar/data-binding/overview.md

@@ -66,7 +66,7 @@ Each `PanelBarBinding` tag exposes the following properties that refer to item p
 
 * ItemsField => Items
 
-* Level—this is used for defining [custom field bindings](#custom-field-bindings) or [different bindings for different levels](#multiple-level-bindings). If no level is set, the bindings are taken as default for any level that does not have explicit settings. You should have one `TelerikPanelBarBinding` without a level to set the default bindings.
+* Level—this is used for defining [custom field bindings](#custom-field-bindings) or [different bindings for different levels](#multiple-level-bindings). If no level is set, the bindings are taken as default for any level that does not have explicit settings. You must have one `TelerikPanelBarBinding` without a level to set the default bindings.
 
 >tip There are default values for the field names. If your model names match the defaults, you don't have to define them in the bindings settings.