{ 
  "table":"cust",
  "layout":"form",
  "onecolumn":true,
  "caption": ["JS Links"],
  "fields": [
    {"name": "cust_id", "caption": "Customer ID", "control": "label"},
    {"name": "cust_name", "caption": "Customer Name", "control": "textbox"},
    {"name": "cust_email", "control": "hidden"},

    {"control": "button", "value":"JavaScript Alert", "link": "js:XExt.Alert('Sample Alert');"},
    {"control": "button", "value":"JavaScript popupForm", "link": "js:XExt.popupForm(xmodel.namespace+'FieldLinks_Cust','insert',{ 'cust_name': 'New Customer' });"},
    {"control": "button", "value":"JavaScript Email", "link": "js:var email = xmodel.get('cust_email'); if(email){ var url = 'mailto:'+email; jsh.getFileProxy().prop('src', url); }"}
  ]
}