Add custom field to dialog popup when click on Propose to major incident button

[Deepak Shaerma]

When a user click on Proposed to Major Incident from form Context menu, then this dialog pop-up and it has two fields, my requirement is to add one more mandatory custom field here. 
Field Name :- Managers Group

Type: Reference(sys_user_group)

Help me in this... Please share whole steps end to end ... 

[Ankur Bawiskar]

@Deepak Shaerma 

it is calling a UI page. Did you check the UI page and you can add the reference field in it?

[Deepak Shaerma]

@Ankur Bawiskar  

Yes i checked it, but i dont understand anything, can you provide me step to step proceduce, that i follow and fulfill my requirement, Hope to you.. its my urgent requirement

[Ankur Bawiskar]

@Deepak Shaerma 

I can guide you but cannot share the complete script.

Name of UI Page: mim_propose

use <g:ui_reference> jelly tag and include a reference field on that UI page

Something like this

<div class="form-group">
		<label class="col-sm-2 control-label" for="mim-propose-business-impact">${gs.getMessage('Managers Group')}</label>
		<div class="col-sm-10">
			<g:ui_reference mandatory="true" name="group" id="group" table="sys_user_group" query="active=true"/>
		</div>
	</div>

[Deepak Shaerma]

@Ankur Bawiskar 

working, but not shown mandatory