The Syncfusion® native Blazor components library offers 70+ UI and Data Viz web controls that are responsive and lightweight for building modern web apps.
.NET PDF framework is a high-performance and comprehensive library used to create, read, merge, split, secure, edit, view, and review PDF files in C#/VB.NET.
VKVinoth Kumar Sundara Moorthy Syncfusion Team January 29, 2018 05:49 AM UTC
HI Maciej,
Thank you for contacting Syncfusion support.
You can add new tabs and custom controls (button, dropdown etc.) to the Spreadsheet ribbon by using “XLRibbon.addTab()” and “XLRibbon.addTabGroup()” methods. Please refer the below KB and API documentation link,