how can I add a button on HeaderTemplate without losing default template?

Question

I like the default HeaderTemplate with collapsing and extending options but I need to add a custom button within the template. how can I add a button within the HeaderTemplate.

I want to keep the layout when a category is collapsed.

Vignesh Ramesh · Answer

Hi Emil, 
 
Thanks for contacting Syncfusion Support. 
 
We have achieved your requirement in the sample level using Kanban custom renderer in the specific platform projects.  
 
Please find the demo sample link from the following location. 
 
KanbanSample 
Regards, 
Vignesh R