Combining of two task box. Custom element

Hi Everyone,

I want to add custom element like that . Like combining of two task boxes. It doesnt need to have task properties. But selectable or editable must.

Screenshot_1

But I couldn’t find any example for it. In examples applying append svg to parent. But I need to add selectable and editable boxes like task box. If you help me I ’ will be happy. You can give a link for that. Thank you.

What exactly are you trying to achieve? Are the two boxes in your screen supposed to be one element?

Yes one element. Like vertical Pool/Participiant.
image

But
I have a form near the diagram. I 'm changing form according to element selected. So For this element I want to set my business settings separately for that. I need to call element selected event separately.

Please provide some code example based on https://github.com/bpmn-io/bpmn-js-custom-elements-example so that we know where actually you get stuck.