docs: Add Validator how-to cross-reference to Grid how-to validator how-to

Author: dtopalov

docs/controls/editors/validator/how-to/use-custom-validation-in-grid-filter-menus.md

@@ -0,0 +1,21 @@
+---
+title: Use custom validation in Grid filter menus
+page_title: Use custom validation in Grid filter menus | Kendo UI Validator
+description: "Learn how to use custom validation in the Kendo UI Grid filter menus."
+slug: howto_use_custom_validation_in_grid_filter_menus_validator
+---
+
+# Use custom validation in Kendo UI Grid filter menus
+
+To see the example on how to use the Kendo UI Validator for custom validation in Kendo UI Grid filter menus, refer to [this how-to article]({% slug howto_gridfiltering_custom_validation_filter_menu_grid %}).
+
+## See Also
+
+Other articles on the Kendo UI Validator:
+
+* [Validator JavaScript API Reference](/api/javascript/ui/validator)
+* [How to Show Tooltip on Mouse Over]({% slug howto_showtooltiponmouseover_validator %})
+* [How to Use Use MutationObserver to Add Red Border and Hide Tooltip]({% slug howto_usemutationobserver_addborderandhidetooltip_validator %})
+* [How to Validate Radio Buttons with Only One Error Message]({% slug howto_validateradiowithonemessage_validator %})
+
+For more runnable examples on the Kendo UI Validator widget, browse its [**How To** documentation folder]({% slug howto_addredborderandhidetooltip_validator %}).