---
title: "Customizing dropdown navigation in MAUI PDF viewer toolbar | Nutrient"
canonical_url: "https://www.nutrient.io/guides/maui/user-interface/main-toolbar/dropdown-groups/"
md_url: "https://www.nutrient.io/guides/maui/user-interface/main-toolbar/dropdown-groups.md"
last_updated: "2026-06-09T10:26:34.608Z"
description: "A dropdown group defines a common dropdown container for toolbar item buttons that share the same DropdownGroup property. When grouped together."
---

# Customizing the dropdown navigation in our viewer toolbar

A dropdown group defines a common dropdown container for toolbar item buttons that share the same [`DropdownGroup`](https://www.nutrient.io/api/maui/api/PSPDFKit.Api.Toolbar.IMainToolbarButton.html#PSPDFKit_Api_Toolbar_IMainToolbarButton_DropdownGroup) property. When grouped together, all the toolbar items — except for the selected or default one — are hidden. However, they can be shown by opening the dropdown with the toggle arrow button.

Nutrient MAUI SDK includes some default dropdown groups for `shapes`, `ink`, and `sidebar`-related items.

You can create a new dropdown group or use predefined ones to group more than one `ToolbarItem`. This is done with the `DropdownGroup` property:

```csharp

var customToolbarButton1 = new CustomMainToolbarButton("button 1")
{
    DropdownGroup = "my-group"
};
PSPDFKitController.MainToolbar.ToolbarItems.Add(customToolbarButton1);

var customToolbarButton2 = new CustomMainToolbarButton("button 2")
{
    DropdownGroup = "my-group"
};
PSPDFKitController.MainToolbar.ToolbarItems.Add(customToolbarButton2);

var customToolbarButton3 = new CustomMainToolbarButton("button 3")
{
    DropdownGroup = "my-group"
};
PSPDFKitController.MainToolbar.ToolbarItems.Add(customToolbarButton3);

```
---

## Related pages

- [Activate or deactivate tools in our viewer toolbar](/guides/maui/user-interface/main-toolbar/activate-or-deactivate-tools.md)
- [Create custom tools for MAUI PDF viewer](/guides/maui/user-interface/main-toolbar/create-a-new-tool.md)
- [Customizing download/export buttons in our PDF viewer](/guides/maui/user-interface/main-toolbar/download-export-button.md)
- [Customizing existing tools in our viewer toolbar](/guides/maui/user-interface/main-toolbar/customize-existing-tools.md)
- [Adding page labels to navigation in our viewer](/guides/maui/user-interface/main-toolbar/page-label-navigation.md)
- [Hiding the toolbar in our PDF viewer](/guides/maui/user-interface/main-toolbar/hide-the-toolbar.md)
- [Adjust the placement of the toolbar in our viewer](/guides/maui/user-interface/main-toolbar/placement.md)
- [Customizing responsive navigation in our viewer toolbar](/guides/maui/user-interface/main-toolbar/responsive-groups.md)
- [Removing a tool from the toolbar in our MAUI viewer](/guides/maui/user-interface/main-toolbar/remove-a-tool.md)
- [Rearrange tools in our viewer toolbar](/guides/maui/user-interface/main-toolbar/rearrange.md)