Customize grid with hierarchy "create" command with inline template.

Hi. I am trying to customize grid create command with inline template.
But as i replicate in http://plnkr.co/yRFW0ssSHwaWwnuhQkxS
As soon as i click 'Add User Define Subject' button. Grid disappeared. And inline template is not showing up.
If i use 'popup' template. Template is showing up but that is not what i want.
I want to click 'Add User Define Subject' button. Inline template show up above green background grid. Is that possible?
Thx in advance.